Biogeographic realms

largest of the Earth's eight biogeographic realms

one of the Earth's eight biogeographic realms & six floristic kingdoms

one of the Earth's eight biogeographic realms

one of the Earth's eight biogeographic realms

biogeographic realm

broadest biogeographic division of the Earth's land surface

one of Earth's eight biogeographic realms

one of the Earth's eight biogeographic realms

one of the Earth's eight biogeographic realms

one of the Earth's eight biogeographic realms

thumb|Primary drainage basins in Canada A bioregion is a geographical area defined not by administrative boundaries, but by distinct characteristics such as plant and animal species, ecological systems, soils and landforms, human settlements, and topographic features such as drainage basins (also referred to as "watersheds"). A bioregion can be on land or at sea. The idea of bioregions was adopted and popularized in the mid-1970s by a school of philosophy called bioregionalism, which includes the concept that human culture can influence bioregional definitions due to its effect on non-cultural

global bioclimatic scheme for the classification of land areas

concept was developed by C. Hart Merriam in 1889