It is made up of two major types of countryside. The larger part of the country is covered by a peneplain, which forms a gently undulating landscape with, in some areas, a few isolated hills, the last vestiges of a Precambrian massif. The southwest of the country, on the other hand, forms a sandstone massif, where the highest peak, Ténakourou, is found at an elevation of . The massif is bordered by sheer cliffs up to  high. The average altitude of Burkina Faso is  and the difference between the highest and lowest terrain is no greater than . Burkina Faso is therefore a relatively flat country.