Unity, sometimes known as Western Upper Nile, was one of the 10 states of South Sudan. Unity state was in the Greater Upper Nile region. It had an area of 38,837 km2. Unity was inhabited predominantly by two ethnic groups, the Nuer (majority) and the Dinka (minority).
In 2015, a presidential decree established a new system of 28 states, replacing the previously established 10. Unity state was replaced by the states of Ruweng, Northern Liech and Southern Liech.
The capital of Unity state was Bentiu. Before an administrative reorganization in 1994, Unity was part of a much larger province of Upper Nile, and the state was sometimes called Western Upper Nile.
The counties of Unity were Mayom, Rubkona, Panrieng, Leer, Guit, Koch, Abiemnom, Mayiendit and Payinjiar.
The larger towns were Bentiu, Mayom and Leer.
Other towns were Riangnom, Rub-Koni, Yoahnyang, Tam, Mankien, Wang-Kay, Koch, Nyal and Ganyliel.