WorldOil South Sudan resumes output in key oil area after five-year halt South Sudan restarted crude production in a key oil region almost five years after facilities were shuttered by civil war. South Sudan oil field becomes battleground in civil war as economy reels After 17 months of civil war spanning a swathe of South Sudan bigger than Syria, President Salva Kiir’s survival may hinge on the fate of a single oil field. Paloch in Upper Nile state, the only region still pumping crude in a nation with sub-Saharan Africa’s third-largest reserves, has re-emerged as the rebels’ prime target.