Friel began appearing in Adventure magazine in 1919 with stories set in the Amazon jungle featuring the characters Pedro Andrada and Lourenço Moraes, two seringueiros (rubber-industry workers) who undergo harrowing experiences in the impenetrable jungle surrounding the Javary River, an Amazon tributary which forms part of the border between Brazil and Peru.
The river is one of the best places to observe Amazonian wildlife, including the Amazon river dolphin and tucuxi.
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The Brazilian Boundary Commission ascended it in 1866 to the junction of the Shino with its Jaquirana branch.
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