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Victorian terraced gardens in Umpherston Sinkhole in limestone, Mount Gambier, South Australia, Australia, Pacific

Aerial image of tepuis and Sarisarinama Sinkhole, Jaua-Sarisarinama National Park, Bolivar State, Venezuela, South America

Aerial image of Sarisarinama Sinkhole, Jaua-Sarisarinama National Park, Tepuis, Bolivar State, Venezuela, South America

Sacred Cenote, Mayan ruins, Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, North America

People swimming in Cenote Zaci, carboniferous limestone swallow hole pool, Valladolid, Yucatan, Mexico, North America

Meyil Obruk, 640m wide sinkhole lake, Esentepe, Obruk Plateau, Karapinar, Konya Basin, Anatolia, Turkey, Asia Minor, Eurasia

A young married couple celebrate their ten year anniversary by scuba diving in the clear freshwaters of Devil's Den Springs, a sinkhole in Williston, Florida, as the afternoon sun filters down into the cavern.

A scuba diver surfacing and looking up into the light as he ascends from the bottom of Devil's Den, a sinkhole in Williston, Florda.

A scuba diver ascends into the light emanating above through the sink hole into the clear freshwaters of Devil's Den cave near Williston, Florida.

Two scuba divers in the Garden of Eden cavern part of the cenote system on the Yucatan Peninsula of Mexico.

Scuba diver in the Garden of Eden cavern part of the cenote system on the Yucatan Peninsula of Mexico.

Greenland Lake reduced to a mud hole, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Greenland Lake reduced to a mud hole, Grand Canyon North Rim, UNESCO, Arizona, United States of America

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona.

Snorkelers swim above a blue hole on Palau's barrier reef. This hole formed when sea level was much lower than it is today.

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona.

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona.

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona.

Super Panorama of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona. Created by stitching 5 photos together.

Harrington Sound, close to the site of the former Devil's Hole sinkhole, Smiths Parish, Bermuda, Atlantic, North America

Harrington Sound, close to the site of the former Devil's Hole sinkhole, Smiths Parish, Bermuda, Atlantic, North America

Sinkhole Plain, polygonal doline karst, near Mammoth Cave, Kentucky, United States of America, North America

A twenty ton ice explorer truck owned and run by Arngrimur Hermannsson ( Arni), next to a sink hole for meltwater (moulin), Langjokull ice cap, Iceland, Polar Regions

A twenty ton ice explorer truck owned and run by Arngrimur Hermannsson (Arni), taking tourists onto the Langjokull ice cap, Iceland, Polar Regions

A twenty ton ice explorer truck owned and run by Arngrimur Hermannsson ( Arni), next to a sink hole for meltwater (moulin), Langjokull ice cap, Iceland, Polar Regions

Swimming at Cenote Ik Kil in Yucatan, Mexico, a natural pit, or sinkhole near Chichen Itza. Yucatan Peninsula, Quintana Roo, Mexico. Ik Kil was sacred to the Mayans who used this cenote for both relaxation and ritual services centuries ago.

Gran Cenote de Tulum in Yucatan Peninsula, Quintana Roo, Mexico. There are thousands of cenotes dotted all over Mexico���s Yucatan Peninsula, and their existence is as much a defining characteristic of the region as is the distinct geological feature from which they result. Once revered by the ancient Mayans as sacred wells, they are now magnets for tourists, adventurers, and explorers alike.