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| ISO-3166-2 | Fips | Name of Subdivision | Capital | Population | area in km² | |
|---|---|---|---|---|---|---|
| 1 | AD | 07 | Adrar | Atâr | 59,670 | 198,302.8 |
| 2 | AS | 03 | Assaba | Kiffa | 285,142 | 36,379.9 |
| 3 | BR | 05 | Brakna | Aleg | 256,827 | 34,585.0 |
| 4 | DN | 08 | Dakhlet Nouadhibou | Nouâdhibou | 80,181 | 16,145.4 |
| 5 | GM | 10 | Guidimaka | Sélibabi | 219,674 | 11,012.6 |
| 6 | GO | 04 | Gorgol | Kaédi | 274,337 | 8,977.4 |
| 7 | HC | 01 | Hodh Ech Chargui | Néma | 298,625 | 182,268.1 |
| 8 | HG | 02 | Hodh El Gharbi | 'Ayoûn el 'Atroûs | 243,246 | 55,441.2 |
| 9 | IN | 12 | Inchiri | Akjoujt | 46,402.9 | |
| 10 | NO | Nouakchott | 709,856 | |||
| 11 | TA | 09 | Tagant | Tidjikja | 64,808 | 94,863.1 |
| 12 | TR | 06 | Trarza | Rosso | 269,946 | 69,653.5 |
| 13 | TZ | 11 | Tiris Zemmour | Fdérik | 63,306 | 287,537.7 |
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