The Rio Ouro Preto Biological Reserve ( pt, Reserva Biológica do Rio Ouro Preto) is a biological reserve in the state of

Rondônia Rondônia () is one of the 26 states of Brazil, located in the northern subdivision of the country (central-western part). To the west is a short border with the state of Acre, to the north is the state of Amazonas, in the east is Mato Grosso, ...

, Brazil.

Location

The Rio Ouro Preto Biological Reserve is in the municipality of

Guajará-Mirim Guajará-Mirim is a municipality in the Brazilian state of Rondônia. It is located at an altitude of 128 meters. Its population was 46,556 (2020) and its area is 24,856 km².IBGE /ref> Location Guajará-Mirim lies along the Mamoré River, j ...

, Rondônia. It has an area of . The reserve has no inhabitants. It is east of the town of Guajará-Mirim on the Bolivian border. The

Ouro Preto River Ouro is a municipality in the state of Santa Catarina in the South region of Brazil. See also *List of municipalities in Santa Catarina This is a list of the municipalities in the state of Santa Catarina (SC), located in the South Region of ...

, after which it is named, runs through the

Rio Ouro Preto Extractive Reserve The Rio Ouro Preto Extractive Reserve ( pt, Reserva Extrativista Rio Ouro Preto) is an extractive reserve in the state of Rondônia, Brazil. Created in 1990, it was one of the first such reserves in Brazil. The residents extract rubber, nuts and ot ...

to the north. The Rio Ouro Preto Biological Reserve runs along a line of low hills that separate the Rio Ouro Preto Extractive Reserve from the

Rio Pacaás Novos Extractive Reserve Rio or Río is the Portuguese, Spanish, Italian, and Maltese word for "river". When spoken on its own, the word often means Rio de Janeiro, a major city in Brazil. Rio or Río may also refer to: Geography Brazil * Rio de Janeiro * Rio do Sul, a ...

to the south. The reserve is in the

Pacaás Novos River The Pacaás Novos River ( pt, Rio Pacaás Novos) is a river of Rondônia state in western Brazil. It is a tributary of the Mamoré River, which it joins from the right just above Guajará-Mirim. The Pacaás Novos River rises in the mountains in th ...

basin. It is in the

pediplain In geology and geomorphology a pediplain (from the Latin ''pes'', genitive case ''pedis'', meaning "foot") is an extensive plain formed by the coalescence of pediments. The processes through which pediplains forms is known as pediplanation. The ...

of the centre of western Brazil, with altitudes from above sea level, in the

Amazon biome The Amazon biome ( pt, Bioma Amazônia) contains the Amazon rainforest, an area of tropical rainforest, and other ecoregions that cover most of the Amazon basin and some adjacent areas to the north and east. The biome contains blackwater and white ...

. Soils include

quartz Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical form ...

sand, red-yellow

podzol In soil science, podzols are the typical soils of coniferous or boreal forests and also the typical soils of eucalypt forests and heathlands in southern Australia. In Western Europe, podzols develop on heathland, which is often a construct of hum ...

s and rocky outcrops. The vegetation of the reserve is almost intact. It includes open submontane rainforest (54.82%), dense montane Savana of the Pacaás Novos (16.58%), rainforest-savanna transition (14.52%) and arboreal savanna (5.21%).

History

The Rio Ouro Preto Biological Reserve was created by decree 4.580 of 28 March 1990 with an area of about , administered by the Rondônia Secretariat of State of the Environment (SEMARO). An act of 30 June 2004 gave preliminary approval for assignment of an area of , part of the Gleba Samauma, for implementation of the biological reserve. The act included a caveat that the armed forces and federal police had freedom of transit and access to undertake their duties of national security and public law enforcement, including installation of infrastructure such as access roads. The word "State" was added to the unit's title, as "Rio Ouro Preto State Biological Reserve".

Notes

Sources

* * * {{authority control Biological reserves of Brazil Protected areas of Rondônia 1990 establishments in Brazil Protected areas established in 1990