Each of the five regions of the earth's surface into which it was divided by climatic differences, namely the torrid zone (between the tropics), two temperate zones (between the tropics and the polar circles), and two frigid zones (within the polar circles).
User Defined Definitions
"a locally circumscribed place characterized by some distinctive features"
"any of the regions of the surface of the Earth loosely divided according to latitude or longitude"
"an area or region distinguished from adjacent parts by a distinctive feature or characteristic"