West Caroline Islands




J. Hales


Federated States of Micronesia

Major Habitat Type

Oceanic Islands

Drainages flowing into

Pacific Ocean, Philippine Sea

Main rivers to other water bodies

The Ngermeskang and Tabecheding rivers are some of the larger rivers in Palau. Lake Ngardok, located in Palau on the island of Babelthuap, is the largest freshwater lake in Micronesia.



This ecoregion encompasses the westernmost islands of the Caroline Islands in Micronesia. It includes the island groups of Palau and Yap, which are located in the western Pacific Ocean bordering the Philippine Sea.

Terrestrial habitats

This ecoregion includes two terrestrial ecoregions: the Palau tropical moist forests [OC0110] and Yap tropical dry forests [OC0204] (WWF 2001).

Description of endemic fishes

The ecoregion contains a few endemic gobies, including Smilosicyopus fehlmanni, Stenogobius fehlmanni, and Stiphodon pelewensis.

Justification for delineation

The West Caroline Islands ecoregion was defined on the basis of distinctive (endemic or near-endemic) fish faunas.


  • World Wildlife Fund (WWF) (2001) \Terrestrial Ecoregions of the World\ "<"http://www.worldwildlife.org/wildworld/profiles/terrestrial_nt.html">"