The Zelten oil field (now known as the Nasser field) is located at the foot of the Zelten Mountains, about 169 kilometres (105 mi) south of Brega in Concession 6. Zelten holds the title as the largest oil field in the Gulf of Sidra. The 229 wells in Zelten use a gas lifting system. The Zelten oil field is not associated with the town Zelten, which is located in the North-West of Libya.