Limmu Kosa is one of the woredas in the Oromia Region of Ethiopia. It is named in part after the former kingdom of Limmu-Ennarea, whose territories included the area this woreda now covers. Part of the Jimma Zone, Limmu Kosa is bordered on the south by Kersa, on the southwest by Mana, on the west by Gomma, on the northwest by the Didessa River which separates it from the Illubabor Zone, on the north by Limmu Sakka, on the northeast by the Gibe River which separates it from the Mirab Shewa Zone and the Southern Nations, Nationalities and Peoples Region, on the east by Sokoru, and on the southeast by Tiro Afeta. The administrative center of this woreda is Genet; other towns include Ambuye and Babu. Chora Botor woreda was separated from Limmu Kosa.
The altitude of this woreda ranges from 1200 to 3020 meters above sea level. Rivers include the Awetu and the Dembi; notable landmarks include Lake Cheleleki and the Bolo Caves. Protected areas include the Tiro Boter Becho and Babia Folla forests, which cover 938.22 square kilometers. A survey of the land in this woreda shows that 34.9% is arable or cultivable (24.6% was under annual crops), 20% pasture, 39.7% forest, and the remaining 15.4% is considered degraded or built-up areas. Fruits and sugar cane are important cash crops.Coffee is another important cash crop of this woreda. Over 50 square kilometers are planted with this crop.