Arsi () is a zone in Oromia Region of Ethiopia, named after a clan of the Oromo, who inhabit in the area. Arsi is bordered on the south by Bale Zone, on the southwest by the West Arsi Zone, on the northwest by East Shewa Zone, on the north by the Afar Region and on the east by West Hararghe Zone. It covers an area of 19,825.22 km2, divided into 25 districts (weredas). The population was officially estimated at 3,894,248 in mid 2022. The highest point in Arsi Zone is Mount Chilalo; other notable mountains in this zone include Mount Kaka and Mount Gugu. Arsi Mountains National Park was created in 2011 to protect a section of the mountains. The administrative centre of this zone is in Asela, with an estimated 139,537 inhabitants in mid 2022; other towns in this zone (with estimated populations in mid 2022) include Bokoji (36,805) in Limuna Bilbilo District, Robe (31,445) in Robe District, Etaya (31,094) in Hitosa District, Dera (30,676) in Dodota District, Abomsa (30,377) in Merti District, Hurta (27,523) in Lude Hitosa District, Sagure (24,932) in Digeluna Tijo District, and Kersa (23,313) in Munesa District. Some districts in the southwestern part of this zone were separated from Arsi Zone to create a new West Arsi Zone. History Aanolee massacre In Hitosa, the Aanolee massacre took place on 6 September 1886, in which Emperor Menelik II's army massacred 11,000 Arsi Oromo in one day, cutting women's breasts and men's hands. In 2014, a monument has been erected to remember the victims. Economy Coffee has been a major cash crop in Arsi as early as 1912, when two Belgian companies were granted concessions of 1,464 hectares of land for cultivating coffee in the area of the current Zone. After World War I, these companies encountered financial difficulties and merged, and harvested as much as 613 tons of coffee at their peak (1931-21). The Central Statistical Agency (CSA), reported that 2198 tons of coffee were produced in this zone in the year ending in 2005, based on inspection records from the Ethiopian Coffee and Tea authority. This represents 1.9% of the Region's output and 0.97% of Ethiopia's total output. Arsi University was established in 2014 at Asella. Demographics Based on the 2007 Census conducted by the CSA, this Zone has a total population of 2,637,657, of whom 1,323,424 are men and 1,314,233 women; with an area