 Mayotte is a primarily volcanic island rising steeply from the bed of the ocean to a height of on Mont Bénara (Open Street Map gives this as ).Two volcanic centres are reported, a southern one (Pic Chongui, , with a breached crater to the NW, and a northern centre (Mont M'Tsapéré, ) with a breached crater to the south-east.Mont Bénara is on the curving ridge between these two peaks, approximately at the contact point of the two structures.