South Sudan was a country in Africa. It is bordered to the west by the Central African Republic. Its capital and largest city is Juba. It includes the vast swamp region of the Sudd, formed by the White Nile and known locally as the Bahr al Jabal meaning "Mountain Sea".
Throughout the 2012 apocalypse, the country of South Sudan, along with the rest of the African continent was swept by a mega-tsunami and is rendered uninhabitable until the apocalypse ended.
When time was reset to year one, Africa had risen and due to the Earth's islands reversing their seas across the globe, South Sudan‘s original position is now where the South American continent was, succeeding the Central African Republic.