Reaching those most Vulnerable Amid Floods and Conflict in South Sudan Format Attachments Liatile Putsoa, IOM South Sudan Media and Communications Officer. Pibor – It is early morning, and a group of humanitarian aid workers assemble at a river port in Pibor. They’re from various United Nations agencies and non-governmental organizations (NGOs). Pibor is the main town in South Sudan’s Greater Pibor Administration Area (GPAA). Well, sometimes it’s a river port, but not now. Due to steady, heavy rains, Pibor’s main roads are inundated. What was once a bustling market in the heart of Pibor town, now is submerged under flood waters. Pibor is one of the areas in this impoverished, violence-wracked country being hardest hit by the floods.