Chad Basin British and French concluded an agreement to clarify the boundary between French West Africa and what would become Nigeria. A boundary was agreed along a line from Say on the Niger to Barruwa on Lake Chad, but leaving the Sokoto Caliphate in the British sphere. Parfait-Louis Monteil was given charge of an expedition to discover where this line actually ran. On 9 April 1892 he reached Kukawa on the shore of the lake. Over the next twenty years a large part of the Chad Basin was incorporated by treaty or by force into French West Africa. On 2 June 1909
Languages of Chad teachers for the deaf train in Nigeria. ("Ethnologue" lists 54 Chadic languages in Chad altogether, many of them small.) Languages of Chad Chad has two official languages, French and Modern Standard Arabic, and over 120 indigenous languages. A vernacular version of Arabic, Chadian Arabic, is the lingua franca. Of the two official languages, French has the most speakers in Chad (though Chadian Arabic has more speakers in Chad than both French and Standard Arabic) . Chad submitted an application to join the Arab League as a member state on 25 March 2014, which is still pending. Chadian Sign Language is