evidence: Chevron’s presence spanned major developments in Sudan’s modern postcolonial history. Chevron was granted its oil concession in 1974, shortly after the agreement on southern autonomy ended the separatist war in the south. Chevron discovered oil in this autonomous region in 1978, and by the time a second civil war broke out in the south in 1983 was developing Unity and Heglig oilfields. Located in today’s GNPOC Blocks 1 and 2 in Western Upper Nile/Unity State, these oilfields were home to the Nuer and Dinka, members of the two largest ethnic groups in southern Sudan. [...] In the north of Western Upper Nile, the government used displacement to make the area "safe" for foreign and northern-based exploitation of oil. The Heglig oil location (in Block 2) was not densely populated, but Dinka lived dispersed in the whole Heglig area and moved their cattle tocattle camps in that same region, according to contemporary accounts, the memories of former residents, and older maps.140 [...] 118 Alier, Southern Sudan, p. 240. According a former governor of Unity State, "Heglig point" was twenty-four kilometers inside the state. Taban Deng Gai, former governor of Unity State, Human Rights Watch interview, Khartoum, July 26, 1999.