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RICHARD BROOKS / SCIENCE PHOTO LIBRARY RICHARD BROOKS / SCIENCE PHOTO LIBRARY
Inlet hole to Jellyfish Lake, in Palau. This lake is one of only a handful of stratified saltwater lakes in the world. It is connected to the sea through three holes near the surface, which allow salt water to flow in and out, with an approximately 100-minute delay from the tidal flow. This process exchanges around 2.5% of the lake's volume with each tide. The lake remains stratified because the holes are near the surface. Its isolation from the ocean has allowed a unique ecosystem to develop. The upper layers are teeming with a unique species of jellyfish (Mastigias cf.
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