Photo by lynseyaddario | Houses are submerged in the village of Wanglei, located in South Sudan's Jonglei State, October 21. Across vast stretches of this remote region, thousands of people are crammed onto patches of high ground bound by stacks of sandbags. Floodwaters have risen to the brink of the sandbag walls, leaving precarious little margin for more rain or excess water flowing down the Nile from neighboring countries. The UN pointed to climate change as the source of the worst flooding in some parts of the country since 1962. Almost every person in Twic East County has been displaced, seeking shelter at former schools or warehouses, or huddling in makeshift tents strung together with plastic sheeting, corrugated metal, and tree branches. As of late October, both the airstrip and the road network were submerged, cutting off vital aid donations of medicine, food, tents, and other essential goods from the United Nations World Food Programme and other international humanitarian org...