Guidimaka (Arabic: ولاية كيدي ماغة, romanized: Wilāyat Kidi Māghah) is the southernmost region of Mauritania. Its capital is Sélibaby. The region borders the Mauritanian region of Assaba to the north-east, Mali to the south-east, Senegal to the south-west and the Mauritanian Gorgol Region to the west. It is named after the historical Soninke state of Guidimakha.
