a) to the north Benin borders on the Niger River for about 120 km.and the three main mid-course tributariesof that river (Alibori, Sota, and Mekrou)
b) The Pendjari River, a tributary of the Volta,drains the western slopes of the Atakora mountainsand runs for some 400 km. through
Benin before entering Togo.
c) Mono (360 km.)
d) Couffo (240 km.)
e) oueme (700 km), arise on the central plteau.
The greatest of the flood plains.