Chad–Nigeria relations in the late 1970s, clashes occurred around Lake Chad, where both countries hoped to exploit oil reserves. Both also sought to defuse these confrontations, first by establishing joint patrols and a commission to demarcate the boundary across the lake more clearly. Then in the early 1980s, the low level of Lake Chad brought a series of tiny islands into view, leading to further disputes and disrupting long-standing informal trade networks. This relationship was also complicated by Nigeria's own instability in the north, generated by rising Islamic fundamentalism. Thousands of casualties occurred as the result of violent clashes in Nigeria throughout
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