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Hydrography;
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
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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.