Africa's longest-running civil war ended on 9 January 2005 when the Sudanese government and southern rebels signed a peace treaty in Nairobi, Kenya.
Tens of thousands of Sudanese attended rallies to celebrate the historic event.
President Omar al-Bashir told a rally in the main southern town, Juba, that, "peace is the gift I bring to you," and "we shall, God willing, fight no more".
He also said the end of the war would bring a big rise in living standards and urged the millions of people displaced by the war to return home.
Rebel leader John Garang told a cheering crowd in Nairobi that the peace deal would change Sudan "forever".
The north-south 21-year-old civil war claimed at least 1.5 million lives and displaced another four million people.
Do you welcome the peace deal? What does it mean to you? If you were displaced during the war, do you intend to return home now? Are you positive you will have equal rights and opportunities? What are your plans for once you are back?
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