Located on an uninhabited rock island off the coast of Koror in Palau, Jellyfish Lake is one of 70 saltwater lakes on this South Pacific archipelago that were once connected to the ocean, but are now cut off.
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How to Visit the Jellyfish Lake in Palau. Jellyfish Lake (Ongeim'l Tketau) is located on Eil Malk Island in Palau, which is part of the Rock Islands. It's about 45-minutes from Koror. A 10-day pass for swimming with the jellyfish is $100 USD, though this is not included in the price of most tours.
Though swimming is permitted, scuba diving is highly prohibited as the bottom layer of the lake hosts a poisonous hydrogen sulfide gas that even the lake's jellyfish don't swim near.
No scuba diving allowed.If the two layers of the lake ever were to mix, the entire ecosystem of the lake could be affected. Besides the fact that exhaust bubbles could harm the jellyfish, the deeper anoxic layer of the lake contains hydrogen sulfide, which is poisonous to humans.
Contrary to tourist myth, the jellyfish are not “non-stinging”; rather, the lack of natural predators in this marine lake (inside an island, inside an ocean) has led them to evolve away from having very strong stinging cells, so that most of us can glide through the water, bumping into the floating, dancing clear blobs ...
However, scuba diving in the lake is forbidden for two reasons: First, to protect the jellyfish, as the bubbles are likely to get caught under the bells. Second, about 15m (16.4 yds.) below the surface, there are high concentrations of lethal hydrogen sulphide, which can be absorbed through the skin.