Introduction to Jellyfish Lake: Jelly Lake (Jelly Lake) is located on a rocky island called El Malk in the Palau Islands. It was formed about 12,000 years ago when the earth's crust uplifted the island higher than the sea. A flat surface formed by seawater being captured by a depression in its middle. There are millions of jellyfish living in the jellyfish lake. They are hosts of algae and survive through a symbiotic relationship with the algae. The most special thing is that the jellyfish in Palau Jellyfish Lake are herbivorous and are the only non-toxic jellyfish in the world. People can get up close here without fear of getting hurt.