The Adamawa is sometimes dubbed the "water tower" of Cameroon, since a large number of the country's rivers rise in the area. All of these fall into a tropical regime, with a period of high water from May to September during the rainy season, and a period of low water – or even complete dryness – from October to April. Some of these are subject to seasonal flooding as well, such as the Djérem in the area of the Mbakaou Reservoir. The province's rivers fall into three different basins: those that ultimately flow into the Niger River, to Lake Chad, and to the Atlantic Ocean.