Lake Palau is located on one of the islands and is a closed "low-salt" lake in which they live are two kinds of very large numbers of jellyfish. The lake is small, its approximate dimensions of 400 by 150 meters, it resembles a bowl shape, the deepest point about 50 meters. The tentacles of the jellyfish have lost the ability to sting, because the jellyfish were in a confined space and enemies they did not have, so the jellyfish moved to another type of food. Medusa by photosynthesis provide themselves with energy and nutrients. Correctly say that they eat the sun. Diving in the lake is prohibited. Permitted only snorkeling (scuba diving and snorkelling, without immersion).