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

Several million golden jellyfish live in Jellyfish Lake on Eil Malk island in Palau’s Rock Islands. Because the lake was isolated from the ocean roughly 12,000 years ago and has no predators, the jellyfish (Mastigias papua etpisoni) lost their sting over millennia – evolution has no reason to maintain a defensive mechanism that nothing is trying to evade. The result is a lake where you swim directly through clouds of pulsing, translucent jellyfish, feeling them brush gently against your arms and face. This is one of the experiences in the world that genuinely lives up to its reputation.

The jellyfish follow the sun, which provides light to the photosynthetic algae living in their tissues. In the morning they concentrate near the western shore. By midday they’ve drifted east. Snorkelling among them feels genuinely strange – not threatening, but alien in a way that very few swimming experiences manage.

Access and Practicalities

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

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

Scuba diving is banned, because the deeper layers are anoxic – hydrogen sulphide builds up below about 15 metres, which is dangerous to both divers and 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. Not technical, but steep in places and slippery. Wear shoes rather than flip-flops. In July and August the humidity on the trail is serious; bring a litre of water more than you think you need.

Reef-safe sunscreen only – standard chemical sunscreens are banned throughout Palau’s waters and you’ll be asked to buy compliant versions if you don’t have them. They’re available at the airport and at dive shops in Koror.

Koror: Base for Everything

All Palau tours depart from Koror, the main town. Palau Pacific Resort is on a good beach with reef access, rooms from around $250 per night. Sea Passion Hotel in central Koror runs $80-120 per night and is adequate for a trip focused on water activities.

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

Palau has a Japanese culinary influence from the colonial period, so sashimi and ramen appear alongside Filipino staples. Prices are higher than most visitors expect – almost everything is imported, which is reflected directly in the menus.

The jellyfish are most numerous from roughly June through December, with numbers fluctuating. A guide who checked the lake the previous day is the most reliable information source.