Figure 4. Maps of the survey area: Kutupalong mega-camp, Cox ’s Bazar District                GEOGRAPHIC SCOPE   This satellite image shows the population density of the camps. Each white rectangle is the roof of a Rohingya family’s shelter, made from bamboo and tarpaulin. An average of six people live in each shelter. © Google 2020 Map data: SIO, NOAA, U.S. Navy, GEBCO Map images: Maxar Technologies US Dept of State Geographer The mega-camp is adjacent to several host community villages, and its easternmost edge sits less than two kilometers from the border that separates Bangladesh from northern Rakhine State in Myanmar. The border comprises land, river, and maritime sections, including the full length of the Naf River and an area of the Bay of Bengal into which the river flows. Rohingya using temporary border passes once frequently crossed the river to legally enter Bangladesh for medical, business, and religious purposes. For many, these services were more readily accessible than those in Rakhine State. But the border pass system has now been suspended, and the river is less frequently crossed. While both legal and informal trade continue, fewer boats can be seen nowadays. The empty waters of the Naf are a reminder of the fragility that has come to define this frontier separating South and Southeast Asia. 12