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Deer Cave with show cave path, largest cave passage in the world, Gunung Mulu National Park, Sarawak, island of Borneo, Malaysia

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

Rainforest and Surprise River, Franklin-Gordon Wild Rivers National Park, Tasmania, Australia, Pacific

A young woman points out to a water hole at sunset, St. Lucia Wetlands, Kwa-Zulu Natal, South Africa, Africa

Torghatten granite mountain with a hole through it, Torget island, Bronnoy, Nordland county, Norway, Scandinavia, Europe

The Big Hole, part of Kimberley diamond mine which yielded 2722 kg of diamonds, Northern Cape, South Africa, Africa

Looking towards Ravenscar from Boggle Hole, North Yorkshire, Yorkshire, England, United Kingdom, Europe

Leatherback turtle (Dermochelys coriacea) excavating a nest hole, Shell Beach, Guyana, South America

The Big Hole, part of Kimberley diamond mine which yielded 2722 kg of diamonds, Northern Cape, South Africa, Africa

Blue holes and white crystals, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sarakiniko volcanic rock formations at sunset, island of Milos, Cyclades, Greek Islands, Greece, Europe

Frothy seas, Eshaness, jagged cliffs, stacks, geos and blow holes, Northmavine, Shetland Isles, Scotland, United Kingdom, Europe

Cape giraffe (Giraffa camelopardalis giraffa) drinking at water hole, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

The 18th hole on golf course, Fairmont Turnberry Isle Resort and Club, Aventura, Florida, United States of America, North America

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

Kayakers on the beach at Football Hole near Low Newton-by-the-Sea, Northumberland, England, United Kingdom, Europe

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.

September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

Diver enters the cavern system at Chac Mool cenote in the Riviera Maya area of Mexico's Yucatan Peninsula.

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

Dali's Hole at Dinorwig Quarry (Dinorwic Quarry), Eryri (Snowdonia National Park), North Wales, United Kingdom

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

African forest elephant (Loxodonta cyclotis), Dzanga Bai, Dzanga Sangha National Park, UNESCO, Central African Republic

Detail of wind and water erosion in the sandstone cliffs of the King George River, Koolama Bay, Kimberley, Western Australia, Australia, Pacific

Yellow billed stork (Mycteria ibis) and hippo (Hippopotamus amphibius) at a water hole, Lake Manyara National Park, Tanzania, East Africa, Africa

Cattle egret (Bubulcus ibis) and hippo (Hippopotamus amphibius) at a water hole, Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Panoramic view of Ellery Creek Big Hole waterhole in West MacDonnell Ranges surrounded by red cliffs and bush outback vegetation, Northern Territory, Central Australia, Australia, Pacific

Landscape of Ormiston Gorge Water Hole with ghost gum in West MacDonnell Ranges, Northern Territory, Australia, Pacific

Adult yellow-billed storks (Mycteria ibis), on the shore of a watering hole in Hwange National Park, Zimbabwe, Africa

Natural stone arch and open grotto framed by turquoise sea, Otranto, Lecce province, Salento, Apulia, Italy, Europe

Shingle beach and cliffs of Seaton Hole at high tide, Seaton, Jurassic Coast, UNESCO World Heritage Site, Devon, England, United Kingdom, Europe

A beautiful coral reef, dominated by colorful gorgonians, grows along the edge of the Blue Hole in Lighthouse Reef in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

The Blue Hole, a popular destination for swimming, caving and cliff jumping, Blue Hole Park, Hamilton Parish, Bermuda, Atlantic, North America

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Colorful gorgonians and reef-building corals grow in shallow water near the famous Blue Hole in Belize. This part of Central America is well known for its clear waters and beautiful coral reefs.

Bright sunlight shines down on lily pads growing along the shallow edge of a freshwater lake in New England. Aquatic vegetation, which thrives during summer months, provides vital habitat for many fish, amphibians, and reptiles.

A beautiful coral reef, dominated by colorful gorgonians, grows along the edge of the Blue Hole in Lighthouse Reef in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

The famous Eye Hole cave at Pfeiffer Beach, Big Sur, California, United States of America, North America