This is a list offreshwater ecoregions as compiled by theWorld Wildlife Fund (WWF). The freshwater ecoregion system is similar to that forterrestrial ecoregions. The Earth's land surface is divided into eight terrestrialbiogeographic realms or ecozones, which contain hundreds of smaller ecoregions. Ecoregions are classified intobiomes or major habitat types, which have similar climates and vegetation types. The freshwater system is similar, with ecoregions classified into freshwater realms and biomes.
Ecoregions are sorted by biome (major habitat type). The numbers are WWF's ecoregion codes.
