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

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

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

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

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

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

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

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.

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.

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.

Scuba Diver discover Slider Turtle in Gran Cenote, Trachemys scripta venusta, Tulum, Yucatan Peninsula, Mexico