S.S Test Vocabulary Savanna- a plain characterized by coarse grasses and scattered tree growth Sahel- the arid area on the S flank of the Sahara desert that stretches across six countries from Senegal to Chad Delta- A usually triangular alluvial deposit at the mouth of a river Matrilineal- inheriting or determining descent through the female line Patrilineal- inheriting or determining descent through the male line Griot- a member of a hereditary caste among the peoples of western Africa whose function is to keep an oral history of the tribe or village and to entertain with stories, poems, songs, dances, etc