We are concerned here primarily with the northern and western portion of the Mandara mountains, bordering the plains of Borno and Lake Chad, and particularly with the area that contains the range's highest peaks and finest sites. This lies within an area delimited by the towns of Pulke, Gwoza, Madagali and Michika in Nigeria and, in Cameroon, Mozogo, Koza, Mokolo and the village of Rhoumsiki.  (The map shows the international boundary before recent minor adjustments.)