In the Javari valley, rivers act as roads. The larger tributaries are the highways, the "furos" or the narrow waterways that appear in rainy season, akin to cross-country shortcuts.
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Commuters here are mostly fishermen, carried along the waters in simple wooden boats. The rivers are full of incredible species such as the prized - and now endangered - giant Pirarucu.
It's the beauty that has made this remote region one of the most dangerous parts of the Amazon.
Illegal fishing and poaching has become rife. And being right on the border with Peru and Colombia, it's also become a well-known trafficking route for cocaine.
It was this conflict that Dom Phillips and Bruno Pereira were documenting.
Dom Phillips was writing a book on saving the Amazon. Bruno Pereira, a specialist on isolated tribes, was introducing him to his contacts and friends. Both were very familiar with the terrain.
Their disappearance has hit people here hard.
More than 1000km away from the state's capital Manaus, the community feels abandoned by the authorities.
Over the last few years, there have been sweeping cuts to indigenous protection budgets. Under President Jair Bolsonaro - a man who has little time for the indigenous communities or environmental agencies - the indigenous protection agency FUNAI has been weakened, surveillance has fallen, as too have fines doled out to those who break the law.
It's against this backdrop that Bruno Pereira played such an important role in the community here. He helped register and map incidents to be able to denounce crimes to the state. Teaching people how to use drones and GPS to track the poachers and fishermen.