The bay contains three islands, including Arguin and Tidra, as well as numerous sandbanks. It is also the site of the 12,000 km2Banc d'Arguin National Park which includes most of the bay. The park's northern boundary is at Minou; it does not include the Dakhlet Nouadhibou, or the westernmost areas. Smaller bays within the Bay of Arguin include Dakhlet Nouadhibou in the north and Baie de Tanoudert in the east. Other promontories include Minou, Cap Sainte-Anne, Argun, Alzaz, Tagarit and Tafarit. The Oued Chibka, a seasonal and occasional stream flowing only when the climate is partly wet, is in the north-central part.