Bor is a historic city in the Bor County of Jonglei State, in the Greater Upper Nile region of South Sudan, being the epicenter of national liberation revolution with multiple landmarks that tells the story. In Malual-Chaat barrack, statues of liberators and destroyed weapons are conserved and exhibited at historical heritage site. It has also served as the headquarters of Jonglei state. The city is situated on the east side of the White Nile at the southern extent of the sudd, South Sudan's vast central wetlands.

Jonglei State is a state of South Sudan with Bor as its centre of government and the biggest city. Jonglei state comprises nine counties: Bor, Akobo, Ayod, Uror, Duk, Nyirol, Pigi, Twic East, and Fangak. Jonglei State is the largest state by area before reorganisation, with an area of approximately 122,581 km2, as well as the most populous according to the 2008 census conducted in present-day South Sudan's second period of autonomy. The boundaries of the state were again changed as a result of a peace agreement signed on 22 February 2020.