Abuná RiverArticle Free Pass Abuná River, Spanish Río Abuná,
Portuguese Rio Abunã, a headwater of the Amazon, east of the
Cordillera Oriental of the Andes. The navigable river flows for
about 200 miles (320 km) northeast through rain forests, forming
Bolivia’s northern border with Brazil. It joins the Río Madeira,
a tributary of the Amazon, at Manoa, Bolivia. Rubber, Brazil
nuts, quinine, and other forest products are the principal items
of commerce in the sparsely inhabited Abuná region. What made
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