Unique Lake Of Golden Jelly Fish - Jellyfish Lake is a marine lake located on Eil Malk Island in Palau. Jellyfish Lake is around 12,000 years old. There are the millions of golden jellyfish which migrate horizontally across the lake daily. The lake water is layered with the warm surface water containing lots of oxygen. Twice each day, the jellyfish in the lake swim from one side to the other.