West Arsi is one of Oromiya Regional state territory which is surrounded by one National regional it shares bounder line with East Shewa zone to the north, SNNPRS to the west and south, Arsi to the northeast, Guji to the south east and Bale zone to the east. Most parts of the zone have elevations of ranging from 1500 to over 3300m.
Shashemene town is the administrative center of the zone it located at 250km from Finfine and the total area of Zone is 12556km2 West Arsi Zone is located approximately at a distance of 250km from Finfine. It is located in the Rift Valley Region The Astronomical location of West Arsi zone lies between 6012'29" to 7042'55" latitude and 38004'04" to 39046'08" longitude. West Arsi Zone has 12 districts, 4 Urban Administrative, 332 peasants association
Although many parts of this area have been cleared for farming activation’s the land generally high and level with fertility soils.
This area is home to three lakes (langano, Lake Shalla and Abjata) and Kaka Mountain is one of the largest mountains in Oromiya next to Tulu demtu and Chilalo. That is the best ecosystem of afro alpine vegetation