How many jellyfish lakes are there in the world?

Worldwide, only 13 jellyfish-lakes are known. These are located in Palau, Vietnam and Indonesia. Jellyfish lakes are landlocked islands of sea that of filled with immense populations of the golden-jellyfish Mastigias papua and the moonjelly Aurelia aurita.



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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.

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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.

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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.

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