Douglas H. Johnson, an expert on Sudan and member of the 2005 Abyei Boundaries Commission, is the author of When Boundaries Become Borders: The Impact of Boundary-making in Southern Sudan's Frontier Zones published in 2010 by the Rift Valley Institute in Nairobi. Click here to access the entire book.
On 2 May 2012, Johnson published on the Rift Valley Institute website a brief analysis of the dispute over Heglig. Although Heglig is internationally recognized as part of Sudan, he argued that the issue must ultimately be determined in terms of the Comprehensive Peace Agreement and whether Panthou/Heglig is east or west of the boundary line established in 1931. He believes that if it is east, then it is part of Unity State in South Sudan. If it is west, then it is part of Southern Kordofan State in Sudan.
Click here to read his update on Panthou/Heglig.