Ouémé is one of the twelve departments of Benin, containing the capital of the country Porto Novo, named for the Ouémé River. It is subdivided into nine communes, each centred at one of the principal towns: Adjarra, Adjohoun, Aguégués, Akpro-Missérété, Avrankou, Bonou, Dangbo, Porto-Novo and Sèmè-Kpodji. In 1999, the northern section of Ouémé was split off to form the department of Plateau.