In the past years in Jonglei state in northeastern South Sudan violence has erupted several times. These recurring episodes of intercommunal violence have devastating consequences for the population, the attacks cause displacement and loss of livelihoods for hundreds or even thousands of people. During the rainy season people are even more exposed to diseases like malaria, respiratory infections, and diarrhoea. To try to answer the needs of the population MSF runs a primary healthcare centre in the town of Pieri and is currently exploring opening a new outreach site around the town. A better understanding of the geography and population numbers of Pieri and surrounding villages will help the MSF team to develop this new site.