Fouta Djallon or Futa Jallon both: fo͞o´tä jälôN´ [key], highland region, c.30,000 sq mi (77,700 sq km), central Guinea, W Africa. Largely a rolling grassland (average alt. c.3,000 ft/910 m), the region is grazed by cattle of the Fulani. The Niger, Senegal, and Gambia rivers rise there. Since the 18th cent. it has been a stronghold of Islam.
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