The Abuna River (, ) 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 tributary, 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 ...

, it forms part of the

border Borders are generally defined as geography, geographical boundaries, imposed either by features such as oceans and terrain, or by polity, political entities such as governments, sovereign states, federated states, and other administrative divisio ...

between northern

Bolivia Bolivia, officially the Plurinational State of Bolivia, is a landlocked country located in central South America. The country features diverse geography, including vast Amazonian plains, tropical lowlands, mountains, the Gran Chaco Province, w ...

and north-western

Brazil Brazil, officially the Federative Republic of Brazil, is the largest country in South America. It is the world's List of countries and dependencies by area, fifth-largest country by area and the List of countries and dependencies by population ...

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

Peru Peru, officially the Republic of Peru, is a country in western South America. It is bordered in the north by Ecuador and Colombia, in the east by Brazil, in the southeast by Bolivia, in the south by Chile, and in the south and west by the Pac ...

vian

Andes The Andes ( ), Andes Mountains or Andean Mountain Range (; ) are the List of longest mountain chains on Earth, longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range ...

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

Manoa Manoa (, ; ) is a valley on the island of Oahu, Hawaii. It is 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 ...

it joins the Río Madeira, a tributary of the Amazon. Opposite the river mouth 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 and the Madeira River upstream from t ...

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