Amazon River

The Amazon River in South America is the largest river by discharge volume of water in the world, and by some definitions it is the longest.
Madeira River

The Madeira River is a major waterway in South America, approximately 3,250 km (2,020 mi) long. The Madeira is the biggest tributary of the Amazon, accounting for about 15% of the water in the basin. A map from Emanuel Bowen in 1747, held by the David Rumsey Map Collection, refers to the Madeira by the pre-colonial, indigenous name Cuyari:
The River of Cuyari, called by the Portuguese Madeira or the Wood River, is formed by two great rivers, which join near its mouth. It was by this River, that the Nation of Topinambes passed into the River Amazon.
Xingu River

The Xingu River is a 1,640 km (1,019 mi) river in north Brazil. It is a southeast tributary of the Amazon River and one of the largest clearwater rivers in the Amazon basin, accounting for about 5% of its water.
Tocantins River

The Tocantins River is a river in Brazil, the central fluvial artery of the country. In the Tupi language, its name means "toucan's beak". It runs from south to north for about 2,450 km. It is not really a branch of the Amazon River, since its waters flow into the Atlantic Ocean alongside those of the Amazon. It flows through four Brazilian states and gives its name to one of Brazil's newest states, formed in 1988 from what was until then the northern portion of Goiás.
Iriri River

The Iriri River is a large tributary of the Xingu River in Brazil, in the state of Pará. It is 1,300 km (810 mi) long making it the 116th longest river in the world and the 15th longest in the Amazon basin. The headwaters are the traditional home of the Panará people.
Curuá River (Iriri River)

The Curuá River is a tributary of the Iriri River in Pará state in north-central Brazil. It is a tributary of the Iriri River.
Jamanxim River
The Jamanxim River is a river of Pará state in north-central Brazil. Originating in the Serra do Cachimbo, it is a tributary of the Tapajós, into which it flows a few kilometers upstream from Itaituba.
Tapajós National Forest

The Tapajós National Forest is a Brazilian national forest in the state of Pará, Brazil. It supports sustainable exploitation of the natural resources in an area of Amazon rainforest.
Serra do Cachimbo

Serra do Cachimbo is a low mountain range in Brazil, in the southern part of the state of Pará, located mostly in the municipalities of Altamira, Itaituba, Jacareacanga, and Novo Progresso.
Nascentes da Serra do Cachimbo Biological Reserve

The Nascentes da Serra do Cachimbo Biological Reserve is a biological reserve in the state of Pará, Brazil. The reserve protects an area in the transition between the Cerrado and Amazon biomes, supporting highly diverse flora and fauna including many endemic species. It is accessible via the BR-163 highway, and is among the federal conservation units in the Amazon Legal that has suffered most from deforestation.
Rio Novo National Park

Rio Novo National Park is a national park in the state of Pará, Brazil.
Whitewater river (river type)

A whitewater river is classified based on its chemistry, sediments and water colour. Whitewater rivers have high levels of suspended sediments, giving the water a pH that is near-neutral, a high electric conductivity and a pale muddy, café au lait-like colour. Whitewater rivers are of great ecological importance and are important to local fisheries. The major seasonal Amazonian floodplains known as várzea receive their water from them.
Jatobá Hydroelectric Power Plant

The Jatobá Hydroelectric Power Plant is a planned hydroelectric power plant and dam on the Tapajós river in the state of Pará, Brazil. As of 2017 the project was suspended.
Chacorão Dam

The Chacorão Dam is a proposed dam on the Tapajós river in the state of Pará, Brazil. It would flood a section of rapids in the river, making them navigable by barges carrying soybeans to ports on the Amazon River. The dam would include locks for the barges and a hydroelectric power plant. It is controversial since it would flood a large area of an indigenous territory.
Cachoeira dos Patos Dam

The Cachoeira dos Patos Dam is a proposed hydroelectric dam on the Jamanxim River in the state of Pará, Brazil. Work has been delayed due to concern about environmental impact and lack of consultation with affected indigenous people.
Tapajós-Xingu moist forests

The Tapajós-Xingu moist forests (NT0168) is an ecoregion in the eastern Amazon basin. It is part of the Amazon biome. The ecoregion extends southwest from the Amazon River between its large Tapajós and Xingu tributaries.
Tocantins-Araguaia-Maranhão moist forests

The Tocantins-Araguaia-Maranhão moist forests (NT0170), also called the Tocantins/Pindaré moist forests, is an ecoregion in the north of Brazil to the south of the mouth of the Amazon River. It is part of the Amazon biome. The ecoregion contains the city of Belém, capital of the state of Pará. It is the most developed part of the Amazon region, and is one of the most severely degraded natural habitats of the region.
Mato Grosso tropical dry forests

The Mato Grosso tropical dry forests (NT0140), also called the Mato Grosso seasonal forests, is an ecoregion in central Brazil to the south of the Amazon region. It contains vegetation in the transition between the Amazon rainforest to the north and the cerrado savanna to the south. The opening of highways through the region has caused rapid population growth, deforestation and pollution.
Clearwater river (river type)

A clearwater river is classified based on its chemistry, sediments and water colour. Clearwater rivers have a low conductivity, relatively low levels of dissolved solids, typically have a neutral to slightly acidic pH and are very clear with a greenish colour. Clearwater rivers often have fast-flowing sections.