The handbook of Tanganyika

Almost throughout Tanganyika, particularly abundant in Western Bukoba, Shanwa, and thence to the Serengeti plains, the Lake yaida - Eyasi area (Mbulu), Sonyo (Loliondo), Mbugwe. Horns obtained from Bukoba, Sonyo, Kampi ya faru near Mbulu and at Rasha-ras

Tanzania. A 12 inch horn is common, 18 inch is good. A horn obtained near Arusha was over 40 inch.