ROBBIE SHONE / SCIENCE PHOTO LIBRARY ROBBIE SHONE / SCIENCE PHOTO LIBRARY
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Cave formations. Cave explorer examining limestone rock formations in a cave in Borneo. Many stalactite crystal formations fill this area, called Keel Passage. This area is in the Clearwater Cave system, located in Gunung Mulu National Park, in Sarawak, the Malaysian part of the island of Borneo. The Clearwater Cave system is one of the largest in the world.
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