Scuba diving in Jellyfish Lake

  • must see
From Boat
Diver level
Average: 15 m
Maximum: 20 m
No currents
Average: 10 m
Maximum: 25 m
Jellyfish Lake is a very popular destination for snorkelers from all over the world. The lake is situated deep in Rock Island. This lake used to be connected to the ocean, but now it is secluded, except for the sea water that percolates into the lake through fissures and tunnels in the limestone cliffs. Snorkeling is safe as long as divers stay away from the unsafe hydrogen sulphide layer that hovers between 15 -20m/49-65ft deep. To reduce the risk of hydrogen sulphide poisoning scuba diving is prohibited here.

When to go

Diving is available all year long, though the high season is between November and May. The average water temperature ranges between 26-29C/78-84F.

What to see

There are about two million jellyfish (including moon and golden species), which sting is not detectable on most human tissue so snorkelers will be delight with the dive. During the day the jellyfish come after the movement of the sunlight, which feeds the algae they survive on.

Reachable from


Liveaboards with trips to Jellyfish Lake

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