Jellyfish Lake — Palau Pacific
Jellyfish Lake (Ongeim'l Tketau) on Eil Malk Island in Palau — a marine lake isolated from the ocean for 12,000 years, producing a unique population of golden jellyfish (Mastigias papua etpisoni) and moon jellyfish (Aurelia sp.) that have lost their stinging cells through evolutionary relaxation of predator pressure, creating the world's only swim-through jellyfish experience without any risk of stinging. The lake's 5–10 million jellyfish migrate east every morning following the sun (the algae in their tissues require specific light intensities), creating a moving mass of pulsing amber bodies in water of extraordinary clarity that parts around the swimmer's arms and closes behind, surrounding the swimmer completely with living jellyfish at every depth. The lake's biological uniqueness (the jellyfish's reduced nematocysts, the marine lake's halocline at 15 metres separating freshwater above from anoxic hydrogen sulphide below) and the encounter's physical impossibility elsewhere creates one of the Pacific's most extraordinary swim experiences.
About this spectacle
Jellyfish Lake (Ongeim'l Tketau) on Eil Malk Island offers one of the world's most singular swim experiences: entering water thick with millions of golden and moon jellyfish that press gently against the skin without stinging. Every morning the jellyfish migrate east in a pulsing amber mass, following the sun to fuel the algae living in their tissues. Swimmers float in extraordinary clarity, watching jellyfish part around outstretched arms and close again behind, surrounded at every depth by softly throbbing amber bells. Below 15 metres, a halocline marks the boundary of an anoxic hydrogen sulphide zone — snorkellers stay above it, but the knowledge of that hidden layer adds to the lake's otherworldly atmosphere. The water glows with diffuse morning light, the jellyfish population numbers in the millions, and the biological isolation of 12,000 years has produced creatures found nowhere else. Sounds are muffled, the pace is slow, and every direction holds the same surreal scene of living amber bodies in clear, still water.
When to go
Jan — Dec
Getting there
Nearest airport: ROR. Nearest city: Koror.
Booking options
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