West Africa
West Africa as defined as a UN subregion consists of Benin Burkina Faso Cape Verde Gambia Ghana Guinea Guinea Bissau Ivory Coast Liberia Mali Mauritania Niger Nigeria Saint Helena Senegal Sierra Leone and Togo Reference Montoroi J P 1995 Mise eli 233 vidence d une s 233 quence de pr 233 cipitation des sels dails les sols sulfat 233 s acides d une vall 233 e am 233 nag 233 e de Basse …