Jellyfish Lake: Palau's saltwater pool with a toxic bottom and surface waters brimming with millions of jellyfish

Jellyfish Lake seen from the viewpoint of a camera that is half in the water and half outside. We see dozens of yellow jellyfish in the water.

QUICK FACTS

Name: Jellyfish Lake, or "Ongeim’l Tketau" in Palauan

Location: Palau, Western Pacific

Coordinates: 7.161200817499221, 134.37633688402798

Why it's incredible: The lake has three layers, including one inhabited by millions of jellyfish and another containing poisonous gas.

Jellyfish Lake is a pool of saltwater on Eil Malk island in Palau that is brimming with golden jellyfish — a subspecies not found anywhere else on Earth. The lake typically houses around 5 million jellyfish, according to the Coral Reef Research Foundation (CRRF) — although there have been years, including 2005, when the number of jellies exceeded 30 million.