Kogin Mille kogi ne na Habasha da rabin Awash ya malale sassan Semien (Arewa) Wollo da Debub (Kudu) Wollo Shiyon na yankin Amhara, da kuma Yankin Gudanarwa na 4 na yankin Afar. Mai binciken L.M. Nesbitt, wanda yayi tafiya a cikin yankin a cikin 1928, ya ji daɗin girmansa, kuma ya bayyana Mille da cewa "mai yiwuwa shine ainihin kogin gaske wanda ya haɗu da Awash". Kogin Ala (A'ura) da Golima River (Golina) ƙananan ƙananan raƙuman ruwa ne na Mille. Kogin Mille yana hawa a tsaunukan Habasha da ke yamma da Sulula a yankin Tehuledere. Yana fara zuwa arewa, sannan ya lankwasa zuwa gabas zuwa ga haɗuwa da Awash a 11°25′N 40°58′E. 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