The Munduruku people publicly identify their territory to demonstrate to Brazilian society and the international community the risk the São Luís do Tapajós dam plan poses to the Amazon forest and their way of life. Working with Greenpeace activists, they are undertaking a community led, unofficial demarcation of their traditional land – which means placing fifty big signs around the perimeter of their territory. The signs look similar to the official signs that the Brazilian government would use if they were doing what their very own departments recommend – recognising this area as Munduruku traditional land. The demarcation is another step in the global effort to stop the construction of the São Luiz do Tapajós hydroelectric dam, which, if built, would flood nearly 400 square km of forest, including important cultural and traditional sites of the Munduruku people and other traditional populations that live around the Tapajós River.