The Collaborative International Dictionary of English v.0.48:

Kalahari \Kalahari\ prop. n.
   A desert in Southwestern Africa, most of which is located in
   the country of Botswana.

   Syn: Kalahari Desert.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Kalahari
    n 1: a desert in southwestern Africa - largely Botswana [syn:
         Kalahari, Kalahari Desert]