Most of Sudan's oil reserves are located in the Muglad and Melut rift basins in the south of the country. Oil fields in the south, such as those at Heglig and in the South Sudanese state of Unity, formerly part of Sudanese territory, are linked to the country's refineries via pipelines. The two largest oil pipelines are the Greater Nile Oil Pipeline, which travels 1,600 kilometres from the Unity oil field to Port Sudan on the Red Sea via Khartoum, and the PetroDar pipeline, which extends 1,380 kilometres from the Palogue oil field in the Melut Basin to Port Sudan.