Much of the country consists of flat or rolling plateau savanna approximately  above sea level. In addition to the Fertit Hills in the northeast of the CAR, there are scattered hills in the southwest regions. In the northwest is the Yade Massif, a granite plateau with an altitude of . The CAR contains six terrestrial ecoregions: Northeastern Congolian lowland forests, Northwestern Congolian lowland forests, Western Congolian swamp forests, East Sudanian savanna, Northern Congolian forest-savanna mosaic, and Sahelian Acacia savanna.