Between 9 and 15 January 2011, a referendum was held to determine whether South Sudan should become an independent country and separate from Sudan, with 98.83% of the population voting for independence. On 23 January 2011, members of a steering committee on post-independence governing told reporters that upon independence the land would be named the '''Republic of South Sudan''' "out of familiarity and convenience". Other names that had been considered were Azania, Nile Republic, Kush Republic and even Juwama, a portmanteau for Juba, Wau and Malakal, three major cities. South Sudan formally became independent from Sudan on 9 July, although certain disputes still remained, including the division of oil revenues, as 75% of all the former Sudan's oil reserves are in South Sudan. The region of Abyei still remains disputed and a separate referendum will be held in Abyei on whether they want to join Sudan or South Sudan. The South Kordofan conflict broke out in June 2011 between the Army of Sudan and the SPLA over the Nuba Mountains.