Tsad

Tsad, or TCHAD; a fresh-water lake of the Soudan, Central Africa, between lat. 12° 30' and 14° 20' N., and long. 13° and 15° 10 E. Its area, which is some 10,000 square miles during the dry season, increases to 40,000 or 50,000 square miles after the rains. The eastern portion consists of an intricate mass of swampy islands, inhabited by negroes.