The terrestrial ecoregions are, in ecology, those ecoregions of land, as distinct from those in the oceans and fresh water.
This conflicts slightly with traditional usage of terrestrial as a synonym for "terran" ("of Earth" in general, whether land or oceans). It follows its alternate meaning, roughly "of dirt", e.g. as in Terrestrial planets, which are not all Earth (i.e. Terra) but only of similar mineral composition.
See also List of the Global 200