It flows past the towns of Carnotville and Ouémé to a large delta on the Gulf of Guinea near the seaport city of Cotonou.

It is located between 6° 30° and 10° north latitude and 0° 52 'and 3° 05' east longitude(Oba S. Alain 2018[full citation needed]).

The lower Delta of Ouémé, is located between latitude 6° 33'N and 8° 15 'and the meridians 1° 50' and 2° 00 ' (Zinsou et al., 2016[full citation needed]).

On the other hand, its hydrological regime depends on the Sudanian climate (north-Benin) with a low water period usually lasts seven months (November to June) and a flood period (July to October) (Lalèyè, 1995[full citation needed]).

The part of the valley covered by the water is very productive in fish (Zinsou et al., 2016[full citation needed]).