 It contains a number of hydrocarbon accumulations of various sizes, the largest of which are the Heglig and Unity oil fields.During the 1960s and 1970s, Chevron made the first oil discoveries in the basin near the towns of Bentiu, Malakal, and Muglad.Taken together, the Muglad and Melut rift basins account for the majority of Sudan's known oil reserves.