Sudanese from the war-torn Blue Nile state collect muddy water, in order to avoid the 12-hour queue at a water pump, in South Sudan’s Doro refugee camp in December. More than 80,000 Sudanese have sought refuge in South Sudan from clashes between government forces and insurgents on the northern side of the poorly-marked and tense border, according to the United Nations. (photo: REUTERS/Hereward Holland)