Niger's topography is comparatively flat, and in the elevation range of and . Tertiary sediments in horizontal layers is the common geological formation is in the lowlands. Plateaux created from the sediment deposits are superimposed by laterite formations not subject to erosion. Sand deposits are a common feature in low-lying areas. The upland areas have the scenic Aïr Mountains in the central north with Mount Greboun (), the Djado plateau in the north-east with elevation varying between and , and the Termit Massif which forms the central east part of the country, the maximum elevation is .