The southern plateau rises northward to the grassy, rugged Adamawa Plateau. This feature stretches from the western mountain area and forms a barrier between the country's north and south. Its average elevation is , and its average temperature ranges from  to  with high rainfall between April and October peaking in July and August. The northern lowland region extends from the edge of the Adamawa to Lake Chad with an average elevation of . Its characteristic vegetation is savanna scrub and grass. This is an arid region with sparse rainfall and high median temperatures.