Abaya is one of the woredas in the Oromia Region of Ethiopia. It is part of former Gelana Abaya woreda what was divided for Abaya and Gelana woredas. Part of the Borena Zone, Gelana Abaya was bordered on the south by Hagere Mariam, and on the west, north and east by the Southern Nations, Nationalities, and Peoples Region (SNNPR). Lake Abaya, on the western border, is divided between this woreda and the SNNPR. However, the Guji Oromo who live in Nechisar National Park are claimed to be administratively part of this woreda, in a kebele called "Irgansaa".
The altitude of this woreda ranges from 800 to 2300 meters above sea level. Perennial rivers include the Gelana and Gildabo. A survey of the land in this woreda shows that 41% is arable (28.7% was under annual crops), 35% pasture, 15% forest, and the remaining 9% is considered swampy, degraded or otherwise unusable. The four major crops grown in this woreda are maize, wheat, barley and haricot beans in that order, with some long cycle sorghum and teff as well; in some parts ensete or the false banana is also grown, which offers a degree of security during famines.Coffee is an important cash crop; over 5,000 hectares are planted with it.
Industry in the woreda includes 2 coffee pulpers, and a number of traders; deposits of ignimbrite and basalt are known but have not been commercially developed. There were 32 Farmers Associations with 5,643 members and 4 Farmers Service Cooperatives. Gelana Abaya has 67 kilometers of dry-weather and 19 all-weather road, for an average road density of 36.4 kilometers per 1000 square kilometers. About 21.6% of the total population has access to drinking water.