Assosa is a zone in Benishangul-Gumuz Region of Ethiopia. This Zone was named after the Assosa Sultanate, which had approximately the same boundaries. Assosa is bordered on the south by the Mao-Komo special woreda, on the west by Sudan, and on the northeast by the Kamashi. The largest town in this zone is Assosa. Its highest point is Mount Bambashi, located in the woreda of the same name. The majority ethnic group in the zone is the Berta people.
The area Assosa occupies came under Ethiopian control in 1898, when Emperor Menelik II skillfully exploited the traditional rivalry of the three local rulers, Sheikh Ejail al-Hassan of Assosa, Sheikh Mahmud of Khomosha and Sheikh Abd al-Rahman Al-Ejail of Bela-Shangul proper. When Ethiopia and the British administration of Sudan demarcated their common border in 1902, this finalized their annexation.[1]