Pilbara freshwater ecoregion

The ecoregion includes, from south to north, the drainages of the Greenough, Murchison, Gascoyne, Ashburton, Fortescue, and De Grey rivers.

During extended dry periods the rivers are reduced to shallow pools in protected canyons.

It adjoins Southwestern Australia to the south, which has a more temperate and moist climate, with more year-round rivers.

There are extensive cave systems on the North West Cape, with subterranean brackish water habitats hosting unique aquatic communities.

Widespread species include the bony bream (Nematalosa erebi), Hyrtl's catfish (Neosilurus hyrtlii), banded grunter (Amniataba percoides), and spangled perch (Leiopotherapon unicolor).