South Sudan is set to become the world's newest nation, following a peace agreement signed in 2005 ending a decade long civil war that left around two million people dead.
Its northern neighbour has become the first to recognise its independence.
According to the peace agreement, all southerners in the north automatically lose their Sudanese citizenship on July 9. But they can choose to apply for residence and to work as foreigners.
Al Jazeera's Mohamed Vall reports from Khartoum.
Source: Al Jazeera