Jellyfish Lake is a geographically isolated lake in Palau, an island nation 2,000 miles south of Japan in the Pacific Ocean. Jellyfish Lake is connected to the nearby ocean through splits and rifts int he limestone reef but is separate enough to have formed into its own unique ecosystem. Two species of jellyfish live in the lake and, as a result of having less predators than their cousins in nearby lake, have a reduced sting, to the point where you can snorkel through a migration.
Check out this crazy video (best watched full screen):
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