Men use mud to construct the wall of their hut in a displaced persons camp in Agok, South Sudan. Tens of thousands of residents of Abyei, a contested region along the border between Sudan and South Sudan, remain displaced in Agok. Under a 2005 peace agreement, Abyei was supposed to have a referendum to decide which country it would join, but the two countries have yet to agree on who can vote. In 2011, militias aligned with Khartoum drove out most of Abyei's Dinka Ngok residents, pushing them across a river into the town of Agok. More than 40,000 Dinka Ngok have since returned to Abyei with support from Caritas South Sudan, which has drilled wells, built houses, opened clinics and provided seeds and tools for the returnees. Yet continuing insecurity means a greater number remain in Agok, where they remain dependant on Caritas and other organizations for food and other support.