Rio Branco-Plácido de Castro International Airport — Rio Branco, Brazil

Rio Branco-Placido de Castro International Airport, coded RBR, serves the remote Amazonian city of Rio Branco, capital of Acre, Brazil's westernmost state bordering both Bolivia and Peru. The airport honors Placido de Castro, a rubber-tapper leader whose fighters wrested the Acre territory from Bolivian control in the early twentieth century, an episode still central to regional identity. Given Acre's dense rainforest terrain and limited highway connections to the rest of Brazil, RBR functions as an essential link rather than merely a convenience, carrying passengers, mail, and goods that would otherwise face days of overland travel. Domestic flights connect Rio Branco chiefly to Brasilia, Sao Paulo, and other regional Amazonian cities. The surrounding state has drawn attention for both its rubber-tapper conservation movements, associated historically with activist Chico Mendes, and its ongoing deforestation pressures, making the airport a gateway for researchers and environmental monitors as well as residents.