Humanitarian workers say that each day, up to 700 people cross the border from South Kordofan into Yida in South Sudan.
The refugees are fleeing the ongoing violence in their home state.
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Children carry their family's belongings as they go to Yida refugee camp in South Sudan outside Tess village in the rebel-held territory of the Nuba Mountains in South Kordofan, May 2, 2012. Fleeing aerial bombardment by the Sudanese air force, thousands of people have abandoned their homes and made make shift shelters between the rocks and boulders. REUTERS/Goran Tomasevic (SUDAN - Tags: CIVIL UNREST)