Fluoride concentrations
Spatial distribution of fluoride concentrations. Concentrations above 1.5 mg/l appear in 12 samples, especially along the Bahr el Ghazal, in the south of the Lake Chad, in the vicinities of the Lake Fitri, and in the Mayo-Kebbi region. Elevated concentrations between 0.5 mg/l and 1.5 mg/l are encountered along the Logone River and along the Chari River in the north of parallel 11° north
Source: BGR