Mto Mille unapatikana nchini Ethiopia kama tawimto la mto Awash ambao unaungana nao kwenye majiranukta 11°25′N 40°58′E﻿ / ﻿11.417°N 40.967°E﻿ / 11.417; 40.967 . Mto Mille unapokea kwanza maji ya mto Ala (A'ura) na Mto Golima (Golina). Orodha ya mito ya Ethiopia The explorer L.M. Nesbitt, who travelled through the area in 1928, was impressed by its size, and described the Mille as "probably the only real river which joins the Awash".Nesbitt, Hell-Hole of Creation: The Exploration of Abyssinian Danakil (New York: Alfred A. Knopf, 1935), p. 201 Routes in Abyssinia 1867, Education Society Press, Bombay