Jonglei is one of the ten states of South Sudan. It is the largest state by area, with approximately 122,581 km2, as well as the most populous according to the controversial 2008 census conducted during present-day South Sudan's second period of autonomy. Bor is the capital of the state.
The current governor of Jonglei State is Kuol Manyang Juuk. Jonglei seceded from Sudan as part of the Republic of South Sudan on 9 July 2011. In the 21st century, Jonglei has been marred by clashes between tribes of the region which the UN estimated in May 2012 had affected the lives of over 140,000 people, and has been heavily influenced by the broader South Sudanese conflict since December 2013.