Jellyfish Lake is a marine lake located on Eil Malk island in Palau. The lake is connected to the sea via three tunnels that lie near the surface. The tunnels channel tidal water in and out of the lake. The millions of golden jellyfish found in the lake, which represent a unique subspecies of Mastigias papua etpisoni jellies. spend much of their lives on the move during a daily migration that follows the sun’s arc across the sky. Jellyfish Lake is one of the best places in the world to enjoy the experience of swimming among a sea of jellies.