Source : Webster's Revised Unabridged Dictionary (1913)

Biogeography \Bi`o*ge*og"ra*phy\, n. [Gr. bi`os life + E.
   geography.]
   The branch of biology which deals with the geographical
   distribution of animals and plants. It includes both
   zo["o]geography and phytogeography. -- {Bi`o*ge`o*graph"ic},
   a. -- {Bi`o*ge`o*graph"ic*al*ly}, adv.

Source : WordNet®

biogeography
     n : dealing with the geographical distribution of animals and
         plants