Oti–Volta languages is rather the case that many people can understand some of a language which is not their mother tongue. These languages are not mutually intelligible with Mõõré or Kusaal (a language spoken in Bawku West District and adjacent areas). Oti–Volta languages The Oti–Volta languages form a subgroup of the Gur languages, comprising about 30 languages of northern Ghana, Benin, and Burkina Faso spoken by twelve million people. The most populous language is Mõõré, the national language of Burkina, spoken by five million people. The family is named for the Oti and Volta rivers. The internal classification of Oti–Volta, as worked
Kwa languages to the various Lagoon languages of southern Ivory Coast and to what are now called the Volta–Niger languages of southern Nigeria. Greenberg (1963) added the Kru languages of Liberia, the Ghana–Togo Mountain languages which Westermann and Bryan had specifically excluded, and Ijaw of the Niger delta; West Kwa included the languages from Liberia to Dahomey (Republic of Benin), and East Kwa the languages of Nigeria. Bennett & Sterk (1977) proposed that the Yoruboid and Igboid languages belonged in Benue–Congo rather than in Kwa. Stewart (1989) removed Kru, Ijaw, and Volta–Niger (East Kwa), but kept the Ghana–Togo Mountain and Lagoon languages,