The Abuna River ( es, Río Abuná, pt, Rio Abunã) is a river in South America. As a part of the

Amazon Basin The Amazon basin is the part of South America drained by the Amazon River and its tributaries. The Amazon drainage basin covers an area of about , or about 35.5 percent of the South American continent. It is located in the countries of Bolivi ...

, it forms part of the

border Borders are usually defined as geographical boundaries, imposed either by features such as oceans and terrain, or by political entities such as governments, sovereign states, federated states, and other subnational entities. Political borders c ...

between northern

Bolivia , image_flag = Bandera de Bolivia (Estado).svg , flag_alt = Horizontal tricolor (red, yellow, and green from top to bottom) with the coat of arms of Bolivia in the center , flag_alt2 = 7 × 7 square p ...

and north-western

Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...

. The river has a total length of . It originates in several streams east of the Cordillera Oriental of the

Peru , image_flag = Flag of Peru.svg , image_coat = Escudo nacional del Perú.svg , other_symbol = Great Seal of the State , other_symbol_type = Seal (emblem), National seal , national_motto = "Fi ...

vian

Andes The Andes, Andes Mountains or Andean Mountains (; ) are the longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range is long, wide (widest between 18°S – 20°S ...

. The river is navigable for circa in its lower northeastern part. At

Manoa Mānoa (, ) is a valley and a residential neighborhood of Honolulu, Hawaii. The neighborhood is approximately three miles (5 km) east and inland from downtown Honolulu and less than a mile (1600 m) from Ala Moana and Waikiki at . Neighbo ...

it joins the Río Madeira, a tributary of the Amazon. Opposite the river mouth there is the town of

Abunã Abunã is district in Porto Velho, the capital of Rondônia, Brazil. It is situated in the Amazon Basin on the right bank of the Madeira River upstream from its confluence with the Abuna River The Abuna River ( es, Río Abuná, pt, Rio Abunã ...

on the Brazilian side of the confluence.

References

Rivers of Acre (state) Rivers of Rondônia Bolivia–Brazil border International rivers of South America Rivers of Pando Department Border rivers {{Rondônia-river-stub