Ogooué-Maritime is the westernmost of Gabon's nine provinces. It covers an area of 22,890 km. The provincial capital is Port-Gentil. It has a 2013 census population of 157,562.
The shores of Ogooué-Maritime are of the Gulf of Guinea to the northwest and the South Atlantic Ocean to the southwest. It is the only coastal province without a foreign border. On land, it borders the following provinces: