Mauritania is divided into 12 regions (capitals in parentheses) and one capital district:

1. Adrar (Atar)
2. Assaba (Kiffa )
3. Brakna (Aleg )
4. Dakhlet Nouadhibou (Nouadhibou)
5. Gorgol (Kaédi)
6. Guidimaka (Sélibaby )
7. Hodh Ech Chargui (Néma )
8. Hodh El Gharbi (Aioun el Atrouss )
9. Inchiri (Akjoujt )
10. Nouakchott (national capital)
11. Tagant (Tidjikdja)
12. Tiris Zemmour (Zouérate)
13. Trarza (Rosso )