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:

• Estuaire – north
• Moyen-Ogooué – northeast
• Ngounié – east
• Nyanga – southeast

Ogooué-Maritime is divided into 3 departments:

• Bendje Department (Port-Gentil)
• Etimboue Department (Omboue)
• Ndougou Department (Gamba)

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• Rabi Kounga oil field