The Mbam River runs along the border with the Centre and Southeast Provinces. The Nkam is the name for the headwaters of the Wouri River, which flow from the West's Bamboutos Mountains. The eastern branch through the area rises northwest of Bangangté, and the western branch forms the border with the Littoral Province southwest of Bafang. These headwaters are subject to seasonal flooding. The Noun River, a tributary of the Sanaga, flows from the Centre Province, around Bafoussam, and to the Bamendjing Reservoir. This man-made lake is created by a dam on the Noun River, which helps regulate the Sanaga at Edéa in the Littoral Province and is thus an important component in Cameroon's supply of hydroelectric power. Falls are common, such as the Balatchi, Metché, and Tsugning Falls.