Kitui County is a county in the former Eastern Province of Kenya with its capital and largest town being Kitui, although Mwingi is also another major urban centre. The county has a population of 1,136,187. and an area of 30,496 km2. It lies between latitudes 0°10 South and 3°0 South and longitudes 37°50 East and 39°0 East.

Embu County is a county of the Republic of Kenya. The capital of Embu County and the former Eastern province headquarters, Embu is a large and largely metropolitan area with a population of 608,599 persons. The county borders Kirinyaga to the west, Kitui to the east, Tharaka Nithi to the north and Machakos to the south. The county occupies an area of 2,821 km2.