Admitted to UN membership on 27 October 1961, Mauritania is a member of ECA and all the non-regional specialized agencies except IAEA. It is also a member of the African Development Bank, ECOWAS, G-77, the Arab League, AU, and the WTO. Mauritania is a signatory to the Lomé Convention and the Law of the Sea. In April 1975, it joined the Association of Iron Ore Exporting Countries. Mauritania has joined with Senegal and Mali to form the Organization for the Development of the Senegal River (Organisation pour la Mise en Valeur du Fleuve Sénégal—OMVS) and is a member with neighboring states of the Interstate Committee to Combat Drought in the Sahel (CILSS).