Serer religion encompasses a belief in a supreme deity called Roog (Koox among the Cangin), Serer cosmogony, cosmology and divination ceremonies such as the annual ''Xooy'' (or ''Khoy'') ceremony presided over by the Serer Saltigues (high priests and priestesses). Senegambian (both Senegal and the Gambia) Muslim festivals such as ''Tobaski'', ''Gamo'', ''Koriteh'', ''Weri Kor'', etc., are all borrowed words from the Serer religion. They were ancient Serer festivals rooted in Serer religion, not Islam.