RICHARD BROOKS / SCIENCE PHOTO LIBRARY RICHARD BROOKS / SCIENCE PHOTO LIBRARY
Underwater limestone cave formations. These formations are in Chandelier Cave, located near Koror, in Palau, a group of islands in Micronesia, in the Western Pacific Ocean. The limestone formations and islands of Palau, known as the Rock Islands, are relics of ancient coral reefs. They are a popular tourist destination, and have been a UNESCO World Heritage Site since 2012.
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