During Ouest Department's existence, departments were the first-level administrative subdivisions of Ivory Coast.

Using current boundaries as a reference, the territory of Sud-Ouest Department was composed of Haut-Sassandra Region, Gôh Region, Montagnes District, and Nawa Region.

Using current boundaries as a reference, in 1963 Ouest Department occupied the same territory as Montagnes District.

The territory of Ouest Department became the new departments of Biankouma, Danané, Guiglo, and Man.

This Montagnes District location article is a stub.