largest biogeographical division of surface land, based on the distribution of terrestrial organisms.

A classification system that defines different parts of the environment with similar geography, vegetation and animal life.

Areas of the Earth's surface representative of large and very generalized ecological units characterized by physical and biological factors. These ecozones can be subdivided further into ecoregio [..]

An area of the earth's surface, representative of large and very generalized ecological units characterized by interactive and adjusting abiotic and biotic factors.  Eolian (adj.):

(biogeography) A large geographical region having a distinct biodiversity of flora and fauna.

The largest biophysical zones in the national ecological classification of Canada.