This dive site, Jellyfish Lake (Ongeim’l Tketauin Palauan), is one of Palau's extraordinary marine lakes, formed by isolated limestone depressions filled with saltwater. Originally connected to the nearby lagoon, its isolation has led to a unique ecosystem where certain species, notably the famous stingless jellyfish, have adapted. Navigation for visitors is simple: swimming and snorkeling in the shallow, well-lit upper layers of the lake, observing the jellyfish. It is crucial to note that this site is not for scuba diving, with a strict 'do not dive below 10ft' rule to protect its fragile environment. Recent reports indicate a significant decline in the golden jellyfish population, so visitors should manage expectations and seek local advice regarding current jellyfish numbers.
The lake is primarily home to millions of stingless golden jellyfish (Mastigias papua etpisoni) and moon jellyfish (Aurelia sp.), which are endemic to Palau and have lost their stinging capabilities due to the absence of natural predators in this isolated environment. While other unique adapted marine lake species may exist, the jellyfish are the undisputed main attraction, despite their recent population decline.
The best time to visit Palau is generally year-round, but for Jellyfish Lake specifically, it is highly recommended to check recent local advice on the jellyfish population before planning a trip. This site offers an unparalleled experience exclusively for snorkelers and freedivers, providing a tranquil and magical encounter with nature. Visitors must respect the strict depth limit of 10 feet (3 meters) to avoid disturbing the sensitive anoxic layers and preserve the lake's delicate ecosystem.
