Jellyfish Lake, Kakaban Island
Overview
Kakaban Island's Jellyfish Lake is one of the most singular natural wonders in the diving world. This ancient brackish lake, nestled in the interior of uninhabited Kakaban Island in the Derawan Archipelago off East Kalimantan, Borneo, is one of only two places on Earth where visitors can swim freely among millions of stingless jellyfish. Over millions of years, four jellyfish species trapped in this landlocked body of water evolved to shed their stinging cells entirely, creating an otherworldly snorkeling experience found nowhere else in Indonesia. The lake itself is approximately 17 meters deep with warm brackish water, a green algae-covered bottom, and visibility that varies from 5 to 10 meters depending on conditions. Swimmers enter from a short jungle trail over raised coral limestone and find themselves surrounded almost immediately by pulsing clouds of translucent golden, moon, box, and spotted jellyfish. The sensation of floating among millions of harmless gelatinous creatures in dappled forest light is genuinely unique in the natural world. While scuba diving is not permitted inside the lake to protect its delicate ecosystem, Kakaban Island's outer reefs deliver some of the Derawan Archipelago's finest underwater terrain. The island's walls drop precipitously to 180 meters, with healthy hard coral coverage, gorgonian fans, and abundant reef fish at recreational depths. Combined with the broader Derawan diving circuit, which includes manta cleaning stations at Sangalaki, green turtle nesting beaches, whale shark encounters, and the muck diving of Derawan's jetty, the Kakaban experience sits within one of Indonesia's most diverse and rewarding dive regions. Water temperatures around the Derawan Archipelago range from 28 to 31 degrees Celsius year-round. The optimal visiting season is March through October, when seas are calmest and the jellyfish population in the lake is at its peak. Getting here requires commitment, with flights to Berau followed by a multi-hour boat transfer, but the reward is access to one of the planet's truly irreplaceable underwater experiences.
Marine life
Dive profile
DEPTH PROFILE
DEPTH PROGRESSION & WAYPOINTS: Jellyfish Lake, Kakaban Island
Location
Frequently asked questions
Can I scuba dive in Kakaban Jellyfish Lake?
Scuba diving is not permitted in the jellyfish lake to protect the fragile ecosystem. Visitors snorkel on the surface and free-dive to experience the millions of stingless jellyfish. However, the outer walls and reefs of Kakaban Island itself offer excellent scuba diving with depths exceeding 30 meters.
Are the jellyfish in Kakaban Lake really stingless?
Yes. Over millions of years of isolation from the open sea, the four jellyfish species in Kakaban Lake have evolved to lose their stinging capability. They pose no danger to swimmers. The lake contains moon jellyfish, golden jellyfish, box jellyfish, and spotted jellyfish, all of which are harmless.
How do I reach Kakaban Island?
Most visitors fly to Berau's Kalimarau Airport from Balikpapan or Jakarta, then take a 2 to 3 hour speedboat to Derawan Island, which serves as the main base. From Derawan, Kakaban is approximately 45 minutes by boat. Several dive resorts on Derawan and Sangalaki Islands organize daily excursions.
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Data Provenance
This profile is compiled from 3 operator submissions and 142 community logs. Key facts (depth, entry) are verified against official hydrographic charts.