It is a referendum that marks the culmination of six years of peace following decades of conflict and could see the mostly Christian south turn its back on historical domination by the muslim north.
Actor George Clooney has campaigned for peace in the troubled East-African state for many years.
At the end of December, Clooney also launched a satellite surveillance project in the country to help monitor violence during the January vote.
The program will use satellite images to assess the situation on the ground for any signs of conflict, monitor hotspots in real time and post the findings online.
Clooney: 'Excitement' for Sudan Peace
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