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Jellyfish Lake in Palau is a mysterious tourist attraction. It is Palau’s only marine lake that has jellyfish and is open to visitors. Tourists can dive into the lake safely, because the jellyfish sting so lightly that most people do not feel it!

Twelve thousand years ago, the sea level rose high enough to fill the marine lake. The age of the lake is estimated scientifically including calculation of rising sea level. That was when jellyfish flowed into the lake from the ocean, according to Wikipedia. They were trapped in the lake as the sea level went back down.

The trapped jellyfish were originally poisonous. They stung other creatures to defend themselves. However, their natural enemies did not find their way into the lake. Without their predators, the jellyfish did not have to use their poison anymore. They naturally evolved with less poison, and eventually became swimmer-friendly animals.

Travelers may swim all they want, but are not recommended to dive in too deep. Jellyfish Lake is divided into two layers. The upper layer is where the swimmers watch jellyfish. The lower layer, 15 m or below from the water surface, is toxic. Divers should avoid this area, or they may become unconscious and even worse.