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Arsi Province (Amharic: አርሲ) was a province of Ethiopian Empire with its capital at Asella. Historically a part of the Emirate of Harar until its invasion by Menelik and subsequent incorporation into modern Ethiopia. The province was reduced to a Zone of the Oromia Region with the adoption of the new constitution in 1995. In more ancient times, the region is seemingly related to the Harla.
Both the Zone and the former province are occupied by the Arsi Oromo, who inhabit both the former Bale and Arsi provinces.