Sink hole in a dirt road in the forest, Finland Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/sink-hole-in-a-dirt-road-in-the-forest-finland-image610318747.html
RF2XCXBP3–Sink hole in a dirt road in the forest, Finland
The Sink or Swim Trail winding through evergreen trees on Snow King Mountain in the Gros Ventre Mountains. Bridger-Teton National Forest, Wyoming Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-the-sink-or-swim-trail-winding-through-evergreen-trees-on-snow-king-170899469.html
RMKX140D–The Sink or Swim Trail winding through evergreen trees on Snow King Mountain in the Gros Ventre Mountains. Bridger-Teton National Forest, Wyoming
A hole on the trunk of a dead tree in a vegetated area near Mount Tangkoko and Duasudara (Dua Saudara) in North Sulawesi, Indonesia. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-hole-on-the-trunk-of-a-dead-tree-in-a-vegetated-area-near-mount-tangkoko-and-duasudara-dua-saudara-in-north-sulawesi-indonesia-image611327278.html
RM2XEGA52–A hole on the trunk of a dead tree in a vegetated area near Mount Tangkoko and Duasudara (Dua Saudara) in North Sulawesi, Indonesia.
Wooden stairway out of a sink hole in Florida. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-wooden-stairway-out-of-a-sink-hole-in-florida-119328515.html
RFGX3TMK–Wooden stairway out of a sink hole in Florida.
A hole on the trunk of a dead tree in a vegetated area near Mount Tangkoko and Duasudara (Dua Saudara) in North Sulawesi, Indonesia. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-hole-on-the-trunk-of-a-dead-tree-in-a-vegetated-area-near-mount-tangkoko-and-duasudara-dua-saudara-in-north-sulawesi-indonesia-image611327438.html
RM2XEGAAP–A hole on the trunk of a dead tree in a vegetated area near Mount Tangkoko and Duasudara (Dua Saudara) in North Sulawesi, Indonesia.
This sink hole in the Tarkine area of Tasmania was created when tannin from bark of submerged trees turned the water dark brown. Very reflective. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-this-sink-hole-in-the-tarkine-area-of-tasmania-was-created-when-tannin-136804015.html
RFHXFXWK–This sink hole in the Tarkine area of Tasmania was created when tannin from bark of submerged trees turned the water dark brown. Very reflective.
A hole on the trunk of a dead tree in a vegetated area near Mount Tangkoko and Duasudara (Dua Saudara) in North Sulawesi, Indonesia. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-hole-on-the-trunk-of-a-dead-tree-in-a-vegetated-area-near-mount-tangkoko-and-duasudara-dua-saudara-in-north-sulawesi-indonesia-image610088770.html
RM2XCFXCJ–A hole on the trunk of a dead tree in a vegetated area near Mount Tangkoko and Duasudara (Dua Saudara) in North Sulawesi, Indonesia.
Sink-hole in a Karst landscape, Wood Buffalo National Park, Northwest Territories, Canada Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/sink-hole-in-a-karst-landscape-wood-buffalo-national-park-northwest-territories-canada-image230969010.html
RMRBNF96–Sink-hole in a Karst landscape, Wood Buffalo National Park, Northwest Territories, Canada
The Sink or Swim Trail winding through the forest on Snow King Mountain in the Gros Ventre Mountains. Bridger-Teton National Forest, Wyoming Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-the-sink-or-swim-trail-winding-through-the-forest-on-snow-king-mountain-170899502.html
RMKX141J–The Sink or Swim Trail winding through the forest on Snow King Mountain in the Gros Ventre Mountains. Bridger-Teton National Forest, Wyoming
MENDOCINO COUNTY, CALIFORNIA, USA - sinkhole near coast. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-mendocino-county-california-usa-sinkhole-near-coast-36981933.html
RMC44JR9–MENDOCINO COUNTY, CALIFORNIA, USA - sinkhole near coast.
Sink hole, Wood Buffalo National Park, Northwest Territories, Canada Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-sink-hole-wood-buffalo-national-park-northwest-territories-canada-70012969.html
RME1WA75–Sink hole, Wood Buffalo National Park, Northwest Territories, Canada
Concrete pipe culvert in the early spring Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/concrete-pipe-culvert-in-the-early-spring-image259712032.html
RFW2EW9M–Concrete pipe culvert in the early spring
The stream in Long Wood entering a swallow hole, part of the Cheddar Complex in the Mendip Hills North Devon Coast National Landscape, Somerset, England. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-stream-in-long-wood-entering-a-swallow-hole-part-of-the-cheddar-complex-in-the-mendip-hills-north-devon-coast-national-landscape-somerset-england-image488348128.html
RM2KAE50G–The stream in Long Wood entering a swallow hole, part of the Cheddar Complex in the Mendip Hills North Devon Coast National Landscape, Somerset, England.
Burgess Hill sink hole water overflowing Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/burgess-hill-sink-hole-water-overflowing-image361840284.html
RF2C0K6Y8–Burgess Hill sink hole water overflowing
Falling Waters, Falling Waters State Park, Florida Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-falling-waters-falling-waters-state-park-florida-146679216.html
RFJEHPRC–Falling Waters, Falling Waters State Park, Florida
Old tree parts rotting and falling into a sink hole. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-old-tree-parts-rotting-and-falling-into-a-sink-hole-124316240.html
RFH672HM–Old tree parts rotting and falling into a sink hole.
Falling Waters, Falling Waters State Park, Florida Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/falling-waters-falling-waters-state-park-florida-image348230416.html
RF2B6F7CG–Falling Waters, Falling Waters State Park, Florida
Girls Descending the steps into Devil's MIllhopper sink hole at Devil's MIllhopper Geological State Park, Gainesville, Florida, USA Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-girls-descending-the-steps-into-devils-millhopper-sink-hole-at-devils-134482332.html
RMHPP5GC–Girls Descending the steps into Devil's MIllhopper sink hole at Devil's MIllhopper Geological State Park, Gainesville, Florida, USA
Ystradfellte Limestone Sink Hole, Brecon Beacons, Afon Mellte Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-ystradfellte-limestone-sink-hole-brecon-beacons-afon-mellte-56536979.html
RMD7YDDR–Ystradfellte Limestone Sink Hole, Brecon Beacons, Afon Mellte
A small pool in a stream in a central Pennsylvanian forest. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-a-small-pool-in-a-stream-in-a-central-pennsylvanian-forest-99904237.html
RFFPF0TD–A small pool in a stream in a central Pennsylvanian forest.
Mountain scene in Gorski kotar Croatia Europe, karst sinhole with snow, forest Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-mountain-scene-in-gorski-kotar-croatia-europe-karst-sinhole-with-snow-24755396.html
RMBC7KN8–Mountain scene in Gorski kotar Croatia Europe, karst sinhole with snow, forest
The Gornjepolje Spring (Gornjepoljski Vir) is a huge karst spring and sink in the Central Montenegro. It is a natural phenomenon called an estavelle. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-gornjepolje-spring-gornjepoljski-vir-is-a-huge-karst-spring-and-sink-in-the-central-montenegro-it-is-a-natural-phenomenon-called-an-estavelle-image214661299.html
RFPD6JJY–The Gornjepolje Spring (Gornjepoljski Vir) is a huge karst spring and sink in the Central Montenegro. It is a natural phenomenon called an estavelle.
Terelle, Italy - March 15, 2009: The small sinkhole in the Terelle countryside in the province of Frosinone Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/terelle-italy-march-15-2009-the-small-sinkhole-in-the-terelle-countryside-in-the-province-of-frosinone-image330545314.html
RF2A5NHWP–Terelle, Italy - March 15, 2009: The small sinkhole in the Terelle countryside in the province of Frosinone
The mouth of a dark, water-filled cave opens on the edge of a forest-covered limestone island near Fak Fak, Indonesia. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-mouth-of-a-dark-water-filled-cave-opens-on-the-edge-of-a-forest-covered-limestone-island-near-fak-fak-indonesia-image552852097.html
RM2R3CGDN–The mouth of a dark, water-filled cave opens on the edge of a forest-covered limestone island near Fak Fak, Indonesia.
The Sink or Swim Trail weaving through an old forest on the side of Snow King Mountain. Bridger-Teton National Forest, Wyoming Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-sink-or-swim-trail-weaving-through-an-old-forest-on-the-side-of-snow-king-mountain-bridger-teton-national-forest-wyoming-image383693452.html
RM2D86MWG–The Sink or Swim Trail weaving through an old forest on the side of Snow King Mountain. Bridger-Teton National Forest, Wyoming
A hole on the trunk of a dead tree in a vegetated area near Mount Tangkoko and Duasudara (Dua Saudara) in North Sulawesi, Indonesia. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-hole-on-the-trunk-of-a-dead-tree-in-a-vegetated-area-near-mount-tangkoko-and-duasudara-dua-saudara-in-north-sulawesi-indonesia-image611329051.html
RM2XEGCCB–A hole on the trunk of a dead tree in a vegetated area near Mount Tangkoko and Duasudara (Dua Saudara) in North Sulawesi, Indonesia.
The Howden, Ladybower reservoir in the Derbyshire Peak District national park, leading to the famous Derwent Dam, scenic and beautiful Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-howden-ladybower-reservoir-in-the-derbyshire-peak-district-national-park-leading-to-the-famous-derwent-dam-scenic-and-beautiful-image337186822.html
RF2AGG56E–The Howden, Ladybower reservoir in the Derbyshire Peak District national park, leading to the famous Derwent Dam, scenic and beautiful
Two concrete pipes culvert in park in the dry summer Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/two-concrete-pipes-culvert-in-park-in-the-dry-summer-image482326818.html
RF2K0KTNP–Two concrete pipes culvert in park in the dry summer
MENDOCINO COUNTY, CALIFORNIA, USA - sinkhole near coast. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-mendocino-county-california-usa-sinkhole-near-coast-36981925.html
RMC44JR1–MENDOCINO COUNTY, CALIFORNIA, USA - sinkhole near coast.
Deep natural sink hole in Grisel, Aragon, Spain . Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/deep-natural-sink-hole-in-grisel-aragon-spain-image272581000.html
RFWRD3RM– Deep natural sink hole in Grisel, Aragon, Spain .
Dragonfly silhouette at the Devil's Millhopper Geological State Park in Florida Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-dragonfly-silhouette-at-the-devils-millhopper-geological-state-park-43646041.html
RFCF06Y5–Dragonfly silhouette at the Devil's Millhopper Geological State Park in Florida
The stream in Long Wood entering a swallow hole, part of the Cheddar Complex in the Mendip Hills North Devon Coast National Landscape, Somerset, England. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-stream-in-long-wood-entering-a-swallow-hole-part-of-the-cheddar-complex-in-the-mendip-hills-north-devon-coast-national-landscape-somerset-england-image488348115.html
RM2KAE503–The stream in Long Wood entering a swallow hole, part of the Cheddar Complex in the Mendip Hills North Devon Coast National Landscape, Somerset, England.
Deep natural sink hole in Grisel, Aragon, Spain. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/deep-natural-sink-hole-in-grisel-aragon-spain-image449748626.html
RF2H3KPXX–Deep natural sink hole in Grisel, Aragon, Spain.
water power Ray Boswell Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/water-power-ray-boswell-image179713039.html
deep lost forest karst lake in the autumn dusk Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/deep-lost-forest-karst-lake-in-the-autumn-dusk-image264125784.html
RFW9KY3M–deep lost forest karst lake in the autumn dusk
Sisters climbing the steps out of Devil's Millhopper Geological State Park, Gainesville, Florida, USA Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-sisters-climbing-the-steps-out-of-devils-millhopper-geological-state-134482339.html
RMHPP5GK–Sisters climbing the steps out of Devil's Millhopper Geological State Park, Gainesville, Florida, USA
Top view of cenote oxman in yucatan mexico on sunny day surrounded by foliage and greenery Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/top-view-of-cenote-oxman-in-yucatan-mexico-on-sunny-day-surrounded-by-foliage-and-greenery-image472800554.html
RF2JD5WX2–Top view of cenote oxman in yucatan mexico on sunny day surrounded by foliage and greenery
A small pool in a stream in a central Pennsylvanian forest. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-a-small-pool-in-a-stream-in-a-central-pennsylvanian-forest-99904762.html
RFFPF1F6–A small pool in a stream in a central Pennsylvanian forest.
Sink hole in Boedmeren forest Schwyz Switzerland Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-sink-hole-in-boedmeren-forest-schwyz-switzerland-16721429.html
RMAX40RJ–Sink hole in Boedmeren forest Schwyz Switzerland
The Gornjepolje Spring (Gornjepoljski Vir) is a huge karst spring and sink in the Central Montenegro. It is a natural phenomenon called an estavelle. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-gornjepolje-spring-gornjepoljski-vir-is-a-huge-karst-spring-and-sink-in-the-central-montenegro-it-is-a-natural-phenomenon-called-an-estavelle-image214661294.html
RFPD6JJP–The Gornjepolje Spring (Gornjepoljski Vir) is a huge karst spring and sink in the Central Montenegro. It is a natural phenomenon called an estavelle.
Terelle, Italy - March 15, 2009: The small sinkhole in the Terelle countryside in the province of Frosinone Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/terelle-italy-march-15-2009-the-small-sinkhole-in-the-terelle-countryside-in-the-province-of-frosinone-image330545377.html
RF2A5NJ01–Terelle, Italy - March 15, 2009: The small sinkhole in the Terelle countryside in the province of Frosinone
The mouth of a dark, water-filled cave opens on the edge of a forest-covered limestone island near Fak Fak, Indonesia. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-mouth-of-a-dark-water-filled-cave-opens-on-the-edge-of-a-forest-covered-limestone-island-near-fak-fak-indonesia-image552852019.html
RM2R3CGAY–The mouth of a dark, water-filled cave opens on the edge of a forest-covered limestone island near Fak Fak, Indonesia.
A small drainage on hte side of Snow King Mountain along the Sink or Swim Trail. Bridger-Teton National Forest, Wyoming Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-small-drainage-on-hte-side-of-snow-king-mountain-along-the-sink-or-swim-trail-bridger-teton-national-forest-wyoming-image383693610.html
RM2D86N36–A small drainage on hte side of Snow King Mountain along the Sink or Swim Trail. Bridger-Teton National Forest, Wyoming
A hole on the trunk of a dead tree in a vegetated area near Mount Tangkoko and Duasudara (Dua Saudara) in North Sulawesi, Indonesia. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-hole-on-the-trunk-of-a-dead-tree-in-a-vegetated-area-near-mount-tangkoko-and-duasudara-dua-saudara-in-north-sulawesi-indonesia-image610637994.html
RM2XDCXYP–A hole on the trunk of a dead tree in a vegetated area near Mount Tangkoko and Duasudara (Dua Saudara) in North Sulawesi, Indonesia.
Arnica wildflowers carpeting a meadow below a dense and mature evergreen forest along the Sink or Swim Trail. Bridger-Teton National Forest, Wyoming Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/arnica-wildflowers-carpeting-a-meadow-below-a-dense-and-mature-evergreen-forest-along-the-sink-or-swim-trail-bridger-teton-national-forest-wyoming-image455684393.html
RM2HDA62H–Arnica wildflowers carpeting a meadow below a dense and mature evergreen forest along the Sink or Swim Trail. Bridger-Teton National Forest, Wyoming
An information sign at the trailhead for Greenland lake along Cape Royal Road at Grand Canyon North Rim Arizona. The lake is actually a sink hole that Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/an-information-sign-at-the-trailhead-for-greenland-lake-along-cape-royal-road-at-grand-canyon-north-rim-arizona-the-lake-is-actually-a-sink-hole-that-image440980278.html
RF2GHCARJ–An information sign at the trailhead for Greenland lake along Cape Royal Road at Grand Canyon North Rim Arizona. The lake is actually a sink hole that
MENDOCINO COUNTY, CALIFORNIA, USA - sinkhole near coast. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-mendocino-county-california-usa-sinkhole-near-coast-36981922.html
RMC44JPX–MENDOCINO COUNTY, CALIFORNIA, USA - sinkhole near coast.
Deep natural sink hole in Grisel, Aragon, Spain . Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/deep-natural-sink-hole-in-grisel-aragon-spain-image272581020.html
RFWRD3TC– Deep natural sink hole in Grisel, Aragon, Spain .
A fireweed wildflower blooming again an old evergreen tree trunk along the Sink or Swim Trail on Snow King Mountain. Bridger-Teton National Forest, Wy Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-a-fireweed-wildflower-blooming-again-an-old-evergreen-tree-trunk-along-170899468.html
RMKX140C–A fireweed wildflower blooming again an old evergreen tree trunk along the Sink or Swim Trail on Snow King Mountain. Bridger-Teton National Forest, Wy
The steps down into the sinkhole at Devil's Millhopper Geological State Park in Florida Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-the-steps-down-into-the-sinkhole-at-devils-millhopper-geological-state-50977800.html
RFCXX6KM–The steps down into the sinkhole at Devil's Millhopper Geological State Park in Florida
Deep natural sink hole in Grisel, Aragon, Spain. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/deep-natural-sink-hole-in-grisel-aragon-spain-image449748624.html
RF2H3KPXT–Deep natural sink hole in Grisel, Aragon, Spain.
Arrowhead balsamroot wildflowers lining a meadow along the Sink or Swim Trail before it descends into an aspen tree grove. Bridger-Teton National Fore Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/arrowhead-balsamroot-wildflowers-lining-a-meadow-along-the-sink-or-swim-trail-before-it-descends-into-an-aspen-tree-grove-bridger-teton-national-fore-image455684367.html
RM2HDA61K–Arrowhead balsamroot wildflowers lining a meadow along the Sink or Swim Trail before it descends into an aspen tree grove. Bridger-Teton National Fore
One of the big sinkholes, within the forest. At the Birzai Regional Park in Lithuania. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/one-of-the-big-sinkholes-within-the-forest-at-the-birzai-regional-park-in-lithuania-image362870416.html
RM2C2A4WM–One of the big sinkholes, within the forest. At the Birzai Regional Park in Lithuania.
Girl looking at camera as she and her sister ascend the steps out of Devil's Millhopper Geological State Park, Gainesville, Florida, USA Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-girl-looking-at-camera-as-she-and-her-sister-ascend-the-steps-out-134482342.html
RMHPP5GP–Girl looking at camera as she and her sister ascend the steps out of Devil's Millhopper Geological State Park, Gainesville, Florida, USA
Cave sky roof sink hole within the Niah National Park Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/cave-sky-roof-sink-hole-within-the-niah-national-park-image384579990.html
RF2D9K3KJ–Cave sky roof sink hole within the Niah National Park
A small pool in a stream in a central Pennsylvanian forest. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-a-small-pool-in-a-stream-in-a-central-pennsylvanian-forest-99904530.html
RFFPF16X–A small pool in a stream in a central Pennsylvanian forest.
Pipe under the road (culverts) large diameter to drain the spring water from the river and the forest through the hole of the pipe Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/pipe-under-the-road-culverts-large-diameter-to-drain-the-spring-water-from-the-river-and-the-forest-through-the-hole-of-the-pipe-image356363226.html
RF2BKNMX2–Pipe under the road (culverts) large diameter to drain the spring water from the river and the forest through the hole of the pipe
The Gornjepolje Spring (Gornjepoljski Vir) is a huge karst spring and sink in the Central Montenegro. It is a natural phenomenon called an estavelle. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-gornjepolje-spring-gornjepoljski-vir-is-a-huge-karst-spring-and-sink-in-the-central-montenegro-it-is-a-natural-phenomenon-called-an-estavelle-image214661284.html
RFPD6JJC–The Gornjepolje Spring (Gornjepoljski Vir) is a huge karst spring and sink in the Central Montenegro. It is a natural phenomenon called an estavelle.
Terelle, Italy - March 15, 2009: The small sinkhole in the Terelle countryside in the province of Frosinone Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/terelle-italy-march-15-2009-the-small-sinkhole-in-the-terelle-countryside-in-the-province-of-frosinone-image330545218.html
RF2A5NHPA–Terelle, Italy - March 15, 2009: The small sinkhole in the Terelle countryside in the province of Frosinone
The mouth of a dark, water-filled cave opens on the edge of a forest-covered limestone island near Fak Fak, Indonesia. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-mouth-of-a-dark-water-filled-cave-opens-on-the-edge-of-a-forest-covered-limestone-island-near-fak-fak-indonesia-image552851981.html
RM2R3CG9H–The mouth of a dark, water-filled cave opens on the edge of a forest-covered limestone island near Fak Fak, Indonesia.
Scuppered wooden rowing boat by a mountain lake in central Norway Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/scuppered-wooden-rowing-boat-by-a-mountain-lake-in-central-norway-image479379139.html
RM2JRWGYF–Scuppered wooden rowing boat by a mountain lake in central Norway
A hole on the trunk of a dead tree in a vegetated area near Mount Tangkoko and Duasudara (Dua Saudara) in North Sulawesi, Indonesia. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-hole-on-the-trunk-of-a-dead-tree-in-a-vegetated-area-near-mount-tangkoko-and-duasudara-dua-saudara-in-north-sulawesi-indonesia-image610637833.html
RM2XDCXP1–A hole on the trunk of a dead tree in a vegetated area near Mount Tangkoko and Duasudara (Dua Saudara) in North Sulawesi, Indonesia.
A knobbed hornbill (Rhyticeros cassidix) female perches above a hole on a dead tree in a vegetated area in Bitung, North Sulawesi, Indonesia. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-knobbed-hornbill-rhyticeros-cassidix-female-perches-above-a-hole-on-a-dead-tree-in-a-vegetated-area-in-bitung-north-sulawesi-indonesia-image610922241.html
RM2XDWWFD–A knobbed hornbill (Rhyticeros cassidix) female perches above a hole on a dead tree in a vegetated area in Bitung, North Sulawesi, Indonesia.
MENDOCINO COUNTY, CALIFORNIA, USA - sinkhole near coast. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-mendocino-county-california-usa-sinkhole-near-coast-36981940.html
RMC44JRG–MENDOCINO COUNTY, CALIFORNIA, USA - sinkhole near coast.
Deep natural sink hole in Grisel, Aragon, Spain . Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/deep-natural-sink-hole-in-grisel-aragon-spain-image272581404.html
RFWRD4A4– Deep natural sink hole in Grisel, Aragon, Spain .
Dwarf palmetto in the Devil's Millhopper Geological State Park, Florida Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-dwarf-palmetto-in-the-devils-millhopper-geological-state-park-florida-50977767.html
RFCXX6JF–Dwarf palmetto in the Devil's Millhopper Geological State Park, Florida
Deep natural sink hole in Grisel, Aragon, Spain. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/deep-natural-sink-hole-in-grisel-aragon-spain-image449748632.html
RF2H3KPY4–Deep natural sink hole in Grisel, Aragon, Spain.
River Pazinčica in the sinkhole in Pazin town Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-river-pazinica-in-the-sinkhole-in-pazin-town-139352546.html
RFJ2M1GJ–River Pazinčica in the sinkhole in Pazin town
One of the big sinkholes, within the forest. At the Birzai Regional Park in Lithuania. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/one-of-the-big-sinkholes-within-the-forest-at-the-birzai-regional-park-in-lithuania-image362869617.html
RM2C2A3W5–One of the big sinkholes, within the forest. At the Birzai Regional Park in Lithuania.
Girl looking back at sister as they descend the steps into Devil's MIllhopper. Geological State Park, Gainesville, Florida, USA Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-girl-looking-back-at-sister-as-they-descend-the-steps-into-devils-134482334.html
RMHPP5GE–Girl looking back at sister as they descend the steps into Devil's MIllhopper. Geological State Park, Gainesville, Florida, USA
Blue lake, a large sinkhole close to more known Red lake at the edge of village of Imotski in southern Croatia on a gray day. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/blue-lake-a-large-sinkhole-close-to-more-known-red-lake-at-the-edge-of-village-of-imotski-in-southern-croatia-on-a-gray-day-image457578335.html
RF2HGCDRB–Blue lake, a large sinkhole close to more known Red lake at the edge of village of Imotski in southern Croatia on a gray day.
A small pool in a stream in a central Pennsylvanian forest. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-a-small-pool-in-a-stream-in-a-central-pennsylvanian-forest-99904260.html
RFFPF0W8–A small pool in a stream in a central Pennsylvanian forest.
Indian Cave, Middle Caicos, Turks and Caicos Islands, Caribbean. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/indian-cave-middle-caicos-turks-and-caicos-islands-caribbean-image244814081.html
RFT686T1–Indian Cave, Middle Caicos, Turks and Caicos Islands, Caribbean.
The Gornjepolje Spring (Gornjepoljski Vir) is a huge karst spring and sink in the Central Montenegro. It is a natural phenomenon called an estavelle. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-gornjepolje-spring-gornjepoljski-vir-is-a-huge-karst-spring-and-sink-in-the-central-montenegro-it-is-a-natural-phenomenon-called-an-estavelle-image214661289.html
RFPD6JJH–The Gornjepolje Spring (Gornjepoljski Vir) is a huge karst spring and sink in the Central Montenegro. It is a natural phenomenon called an estavelle.
Doline at Jalapao - Tocantins - Brazil Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/doline-at-jalapao-tocantins-brazil-image368009779.html
RF2CAM86B–Doline at Jalapao - Tocantins - Brazil
The collapsed roof of a dark, water-filled cave opens into a forest-covered limestone island near Fak Fak, Indonesia. Limestone often harbors caves. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-collapsed-roof-of-a-dark-water-filled-cave-opens-into-a-forest-covered-limestone-island-near-fak-fak-indonesia-limestone-often-harbors-caves-image552633501.html
RM2R32HJN–The collapsed roof of a dark, water-filled cave opens into a forest-covered limestone island near Fak Fak, Indonesia. Limestone often harbors caves.
Scuppered wooden rowing boat by a mountain lake in central Norway Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/scuppered-wooden-rowing-boat-by-a-mountain-lake-in-central-norway-image479379145.html
RM2JRWGYN–Scuppered wooden rowing boat by a mountain lake in central Norway
A natural pond with banana plants is viewed Sirikit Botanical Garden not far from CHIANG MAI, THAILAND Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-natural-pond-with-banana-plants-is-viewed-sirikit-botanical-garden-not-far-from-chiang-mai-thailand-image474959077.html
RF2JGM745–A natural pond with banana plants is viewed Sirikit Botanical Garden not far from CHIANG MAI, THAILAND
Saamal - beautiful Cenote in Mexico, near Chichen Itza Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/saamal-beautiful-cenote-in-mexico-near-chichen-itza-image335545436.html
RF2ADWBHG–Saamal - beautiful Cenote in Mexico, near Chichen Itza
A male individual of knobbed hornbill (Rhyticeros cassidix) is perching above a potential nest hole on a tree in a rainforest area near Mount Tangkoko and Dusudara in Bitung, North Sulawesi, Indonesia. 'A key feature of the rainforests is the high level of species diversity in trees, a characteristic that is vital for the proper functioning of the ecosystem. Species diversity allows the forests to be resilient,' according to a team of researchers of the University of Haifa in a February 2023 publication on Phys.Org. Hornbillls themselves are often called 'farmers of the forest'. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-male-individual-of-knobbed-hornbill-rhyticeros-cassidix-is-perching-above-a-potential-nest-hole-on-a-tree-in-a-rainforest-area-near-mount-tangkoko-and-dusudara-in-bitung-north-sulawesi-indonesia-a-key-feature-of-the-rainforests-is-the-high-level-of-species-diversity-in-trees-a-characteristic-that-is-vital-for-the-proper-functioning-of-the-ecosystem-species-diversity-allows-the-forests-to-be-resilient-according-to-a-team-of-researchers-of-the-university-of-haifa-in-a-february-2023-publication-on-physorg-hornbillls-themselves-are-often-called-farmers-of-the-forest-image528373387.html
RM2NKHDJ3–A male individual of knobbed hornbill (Rhyticeros cassidix) is perching above a potential nest hole on a tree in a rainforest area near Mount Tangkoko and Dusudara in Bitung, North Sulawesi, Indonesia. 'A key feature of the rainforests is the high level of species diversity in trees, a characteristic that is vital for the proper functioning of the ecosystem. Species diversity allows the forests to be resilient,' according to a team of researchers of the University of Haifa in a February 2023 publication on Phys.Org. Hornbillls themselves are often called 'farmers of the forest'.
MENDOCINO COUNTY, CALIFORNIA, USA - sinkhole near coast. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-mendocino-county-california-usa-sinkhole-near-coast-36981902.html
RMC44JP6–MENDOCINO COUNTY, CALIFORNIA, USA - sinkhole near coast.
Emerald pool on the island of Dominica with waterfall Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-emerald-pool-on-the-island-of-dominica-with-waterfall-111424586.html
RFGD7R5E–Emerald pool on the island of Dominica with waterfall
Dovestone reservoir in Peak District with protective overflow wire cage at Saddleworth Moor in Greater Manchester, England. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/dovestone-reservoir-in-peak-district-with-protective-overflow-wire-cage-at-saddleworth-moor-in-greater-manchester-england-image536511597.html
RF2P4T60D–Dovestone reservoir in Peak District with protective overflow wire cage at Saddleworth Moor in Greater Manchester, England.
Sinkhole and dramatic skies at Devil's Kitchen Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/sinkhole-and-dramatic-skies-at-devils-kitchen-image607229953.html
RF2X7WM01–Sinkhole and dramatic skies at Devil's Kitchen
Pontsicill Reservoir on a Cloudy Day, Brecon Beacons, south Wales Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/pontsicill-reservoir-on-a-cloudy-day-brecon-beacons-south-wales-image456080929.html
RF2HE07TH–Pontsicill Reservoir on a Cloudy Day, Brecon Beacons, south Wales
River Pazinčica in the sinkhole in Pazin town Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-river-pazinica-in-the-sinkhole-in-pazin-town-139352566.html
RFJ2M1HA–River Pazinčica in the sinkhole in Pazin town
A weathered wood plank walking path winds down through various sinkholes in the forest. At the Birzai Regional Park in Lithuania. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-weathered-wood-plank-walking-path-winds-down-through-various-sinkholes-in-the-forest-at-the-birzai-regional-park-in-lithuania-image362869402.html
RM2C2A3HE–A weathered wood plank walking path winds down through various sinkholes in the forest. At the Birzai Regional Park in Lithuania.
Wide angle view of Girlfriend Sinkhole in Cuenca Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-wide-angle-view-of-girlfriend-sinkhole-in-cuenca-147040602.html
RFJF67P2–Wide angle view of Girlfriend Sinkhole in Cuenca
Magnificent and majestic red lake close to Imotski, a crater or sinkhole in limestone filled with water, more than 500m deep. December feeling in the Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/magnificent-and-majestic-red-lake-close-to-imotski-a-crater-or-sinkhole-in-limestone-filled-with-water-more-than-500m-deep-december-feeling-in-the-image457578330.html
RF2HGCDR6–Magnificent and majestic red lake close to Imotski, a crater or sinkhole in limestone filled with water, more than 500m deep. December feeling in the
A small pool in a stream in a central Pennsylvanian forest. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-a-small-pool-in-a-stream-in-a-central-pennsylvanian-forest-99904408.html
RFFPF12G–A small pool in a stream in a central Pennsylvanian forest.
The Gornjepolje Spring (Gornjepoljski Vir) is a huge karst spring and sink in the Central Montenegro. It is a natural phenomenon called an estavelle. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-gornjepolje-spring-gornjepoljski-vir-is-a-huge-karst-spring-and-sink-in-the-central-montenegro-it-is-a-natural-phenomenon-called-an-estavelle-image214661306.html
RFPD6JK6–The Gornjepolje Spring (Gornjepoljski Vir) is a huge karst spring and sink in the Central Montenegro. It is a natural phenomenon called an estavelle.
Doline at Jalapao - Tocantins - Brazil Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/doline-at-jalapao-tocantins-brazil-image368009785.html
RF2CAM86H–Doline at Jalapao - Tocantins - Brazil
The mouth of a dark, water-filled cave opens on the edge of a forest-covered limestone island near Fak Fak, Indonesia. Limestone often harbors caves. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-mouth-of-a-dark-water-filled-cave-opens-on-the-edge-of-a-forest-covered-limestone-island-near-fak-fak-indonesia-limestone-often-harbors-caves-image552633171.html
RM2R32H6Y–The mouth of a dark, water-filled cave opens on the edge of a forest-covered limestone island near Fak Fak, Indonesia. Limestone often harbors caves.
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