Jellyfish lake
Jellyfish lake is a marine lake located on Eil Malk island in Palau. Jellyfish Lake is connected to the ocean through fissures and tunnels in the limestone of an ancient Miocene reef.
However the lake is sufficiently isolated and the conditions are different enough that the diversity of species in the lake is greatly reduced from the nearby lagoon. The golden jellyfish and other species in the lake have evolved to be substantially different from their close relatives living in the nearby lagoons.
