This is a stingless jellyfish that has been trapped in Kakaban Lake for over a million years, Kakaban Lake is located in Kakaban Island, East Kalimantan (Borneo), Indonesia. There is 4 species of jellyfish in this lake.

You're safe to swim with them but be careful of something that has not been touched since this lake is not yet known how deep it is, there might be a jellyfish monster hiding deep in the depths of the lake.

“Kakaban Lake has been declared a government nature reserve, and has been nominated as a World Heritage Zone.” Source: indonesia.travel

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