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Man floating in the Dead Sea. Early 20th Century image of a man reading a book while floating in the Dead Sea. The Dead Sea is a salt lake located on the border between Jordan and Israel. At 33.7 percent salinity, it is one of the saltiest bodies of water on Earth, making it easy to float in. At 418 metres below sea level it is also the lowest point on Earth. (KEYSTONE/SCIENCE PHOTO LIBRARY/LIBRARY OF CONGRESS/SCIENCE PHOTO LIBRARY)