Jellyfish Lake: Palau’s Strangest and Most Memorable Swimming Spot

Jellyfish Lake sits in the Rock Islands, a 45-minute boat ride from Koror, inside a land-locked marine lake that was isolated from the ocean thousands of years ago. Because the lake has no predators, the golden jellyfish (Mastigias papua etpisoni) that inhabit it lost their sting over millennia. You can swim directly through clouds of them. It is one of those places that actually lives up to its reputation.

What to Expect in the Water

The jellyfish pulse slowly across the lake following the sun, which provides the algae in their bodies with light they need to survive. In the morning they concentrate near the western shore. By midday they’ve drifted toward the east. Snorkelling alongside several million of them, feeling them brush gently against your arms and face, is a genuinely strange experience.

Scuba diving is banned, because the deeper layers of the lake are anoxic (hydrogen sulphide builds up below about 15 metres) and contact with those waters is dangerous to the jellyfish. Snorkelling only, which is the right call regardless.

The hike from the dock to the lake takes about 15 minutes over a rocky limestone ridge. It’s not technical, but it’s steep in places and slippery. Wear shoes you don’t mind getting muddy, not flip-flops. In July and August the heat and humidity on that trail are serious; bring a litre of water more than you think you need.

Access and Permits

You need a Rock Islands permit (approximately $50 USD per person) plus a Jellyfish Lake specific permit (around $100 USD). These are typically bundled by tour operators in Koror. Most visitors do Jellyfish Lake as part of a full-day Rock Islands tour that includes kayaking, snorkelling at the reefs, and a beach stop. Expect to pay $150-200 per person all-in for a group day tour.

The lake was closed for several years in the mid-2010s after a warming event killed most of the jellyfish population. Numbers recovered. Check current status before booking, since another closure is always possible.

Where to Stay

You base yourself in Koror, the main town. Palau Pacific Resort is on a good beach with a reef right offshore, rooms from around $250/night. For something more affordable, Sea Passion Hotel in central Koror runs $80-120/night and is fine for a trip focused on water activities.

Eating in Koror

Fish n Fins near the main dock serves reliable grilled fish and is a hub for the diving community. For a decent local meal for under $15, try the market area on the east side of town, where stalls serve rice plates with fish or chicken from early morning.

Palau has a Japanese culinary influence from the colonial era, so sashimi and ramen appear on many menus alongside Filipino staples. The quality is generally good; the prices are higher than you’d expect for the region given how much has to be imported.

Practical Notes

Water shoes help for boat entries and reef walking. Reef-safe sunscreen only; standard chemical sunscreens are banned throughout Palau’s waters and you’ll be asked to buy the compliant version if you don’t have it. They sell it at the airport and at most dive shops.

The jellyfish are most numerous from roughly June through December. Numbers fluctuate, and a guide who checked the lake the previous day is worth more than any general advice.