Abia State, which occupies about 5,834 square kilometers, is bounded on the north and northeast by the states of Anambra, Enugu, and Ebonyi. To the west of Abia is Imo State, to the east and southeast are Cross River State and Akwa Ibom State, and to the south is Rivers State.
The southern part of the State lies within the riverine part of Nigeria. It is low-lying with a heavy rainfall of about 2400 mm/year especially intense between the months of April through October. The rest of the State is moderately high plain. The most important rivers in Abia State are the Imo and Aba Rivers, which flow into the Atlantic Ocean through the Niger Delta.