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Jellyfish Lake
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Lake
Jellyfish Lake, locally called Ongeim'l Tketau, is a world-renowned biological wonder located on Eil Malk island in Palau. This marine lake was created roughly 12,000 years ago when rising sea levels subsided, trapping a population of jellyfish in a limestone basin. In the absence of predators, these golden jellyfish (Mastigias papua etpisoni) underwent a remarkable evolutionary change, eventually losing their ability to sting. Today, millions of these harmless creatures inhabit the lake, engaging in a daily migration across the water to follow the path of the sun, which fuels the symbiotic algae living within their bodies. Visitors are permitted to snorkel in the lake, but scuba diving is strictly forbidden to protect the delicate chemical layers of the water column. Gliding through a sea of millions of pulsating golden bells is often described as a dreamlike, ethereal experience, standing as one of the most unique wildlife encounters on the planet.
- Location: Palau
- Nearby: Kloulklubed (16 km)
Best time to visit & climate
The most pleasant time to visit is Feb–Apr.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg °C | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
| Rain mm | 216 | 198 | 184 | 177 | 285 | 338 | 381 | 286 | 275 | 232 | 236 | 257 |
📋 Practical info
Getting there
The lake is accessible solely via organized boat tours to Eil Malk island, followed by a mandatory, moderately steep hike over a rocky limestone ridge starting from the designated mooring dock.
Best season
Snorkeling is generally spectacular year-round, though visiting during sunny days between November and May provides optimal underwater lighting for observing the migrating jellyfish populations.
Terrain & paths
The terrestrial approach involves a rugged, uneven trail composed of sharp coral limestone with considerable elevation changes, while the lake itself has calm, sheltered waters for swimming.
What to bring
Visitors must bring snorkeling gear, eco-friendly and reef-safe sunscreen (often requiring application well before arrival), and sturdy water shoes for the rocky hike over the island ridge.
Parking
There is no conventional parking; tour operators handle all transportation, mooring their boats at specific floating docks where visitors disembark to begin the short overland trek to the lake.
Safety
Scuba diving is strictly prohibited due to a toxic layer of hydrogen sulfide at the lake's bottom; visitors must snorkel gently near the surface to avoid harming the delicate, stingless jellyfish.
Time needed
Most guided tours allocate roughly one and a half to two hours for this specific stop, allowing enough time for the round-trip hike and a magical, unhurried snorkeling experience in the lake.
Geography
Facts
- Home to the endemic golden jellyfish (Mastigias papua).
- The lake is estimated to be around 12,000 years old.
- Connected to the ocean only via tiny rock fissures.
- Snorkeling is permitted, but scuba diving is strictly banned.
- Jellyfish numbers fluctuate based on El Niño cycles.
- The lower layer of the lake is anoxic and hydrogen sulfide-rich.
Explore nearby
Notable places around
Route planner — Car & Motorhome
Where do you start? We build the route here, with stops and country notes along the way.
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© OpenStreetMap contributors · OpenRouteService
Sights in the town Jellyfish Lake (1)
Sights nearby
Frequently asked questions
Is it really allowed to swim in the Jellyfish Lake?
Yes, snorkeling with the non-stinging jellyfish is a unique experience.
Are there rules of conduct in the lake?
Yes, please swim gently and do not touch the jellyfish or lift them from the water.
Do I need special equipment?
A mask and snorkel are sufficient; fins are often not allowed.
How do you get to Jellyfish Lake?
Arrival is by boat followed by a short walk through the forest.
Is the lake accessible year-round?
Yes, it is generally open all year, depending on weather conditions.
Jellyfish Lake: where is it located?
Jellyfish Lake is located in Palau.
Jellyfish Lake: when is the best time to visit?
The most pleasant time to visit is Feb, Apr.
Jellyfish Lake: why is it worth visiting?
Jellyfish Lake, locally called Ongeim'l Tketau, is a world-renowned biological wonder located on Eil Malk island in Palau.
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