In Ziguinchor urban area, the main contact language (which tends to replace Creole) is Wolof; in several eastern villages (Agniack, Baghagha, Fanda, Kougnoundou, Sindone), Mandinka is the main competitor of Creole; in all Casamancese Creole communities, French also exerts a strong influence on daily use, as it is Senegal's official language and the only medium of instruction in schools.