The Rock Islands of Palau, also called Chelbacheb, are a collection of several hundred small limestone or coral uprises in the Southern Lagoon of Palau between Koror and Peleliu, now an incorporated part of Koror State.

There are between 250 and 300 islands in the group according to different sources, with an aggregate area of 42 square kilometers (16 sq mi) and a maximum height of 207 meters (679 ft).

The indentation comes from erosion and from the dense community of sponges, bivalves, chitons, snails, urchins, and others that graze mostly on algae.

[1] Notable islands in the group are: A 4,912 ha site encompassing the Rock Islands has been designated an Important Bird Area (IBA) by BirdLife International because it supports populations of most of Palau’s endemic birds, including Micronesian megapodes, Palau ground doves, Micronesian imperial pigeons, Palau fruit doves, swiftlets and kingfishers, Micronesian myzomelas, morningbirds, Palau fantails, flycatchers and bush warblers, giant, dusky and citrine white-eyes, and Micronesian starlings.

The only inhabited place on the islands is called Dolphin Bay (on Ngeruktabel, 5 km from Koror).