Mauritania is divided in 12 regions (regions, singular - region) and 1 capital district*; Adrar, Assaba, Brakna, Dakhlet Nouadhibou, Gorgol, Guidimaka, Hodh Ech Chargui, Hodh El Gharbi, Inchiri, Nouakchott*, Tagant, Tiris Zemmour, Trarza
The Ras Nouadhibou (formerly Cap Blanc) peninsula, which forms Dakhlet Nouadhibou (formerly Lévrier Bay) to the east, is fifty kilometers long and up to thirteen kilometers wide.