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The Putumayo River: A Shared Amazon Boundary from the Andes to the Içá

The Putumayo rises in the Colombian Andes and flows about 1,800 km (1,100 mi) across the western Amazon, forming a boundary between Colombia, Ecuador, and Peru before joining the Solimões in Brazil as the Içá. Its basin holds Yaguas National Park, Indigenous territories, a rubber-era history of atrocity, and growing pressure from gold mining and mercury.

The Ucayali River: Where the Andes Become the Amazon

The Ucayali forms where the Tambo and Urubamba rivers meet at about 210 m (690 ft) in Peru's rainforest and flows about 1,770 km (1,100 mi) past Pucallpa before joining the Marañón to form the Amazon. Its floodplain shelters giant otters and manatees in Pacaya-Samiria, while the river faces a lapsed waterway concession, land trafficking, oil palm clearing, and dam plans in its Ene headwaters.

The Marañón River: Peru’s Andean Headwater of the Amazon

The Marañón rises above 4,500 m (14,800 ft) in the Peruvian Andes and runs about 1,700 km (1,060 mi) through deep canyons and the Pongo de Manseriche gorge before meeting the Ucayali near Nauta and forming the Amazon. Its basin shelters the floodplain wildlife of Pacaya-Samiria and faces stalled dam plans, oil-pipeline spills, and a 2024 court ruling that recognized the river's legal rights.

Huascarán National Park: Peru's Tropical Ice and Wet Puna

Huascarán National Park protects the heart of the Cordillera Blanca, the world's highest tropical mountain range, in the Áncash region of the central Peruvian Andes. It covers 340,000 ha and rises to Nevado Huascarán, Peru's highest peak at 6,768 m. Its summits, glaciers, turquoise glacial lakes, and giant flowering plants make it one of the Andes' most dramatic landscapes, and its meltwater supplies towns and farms from the Callejón de Huaylas to the Pacific coast.

Tijuca National Park: Rio's Replanted Forest

Tijuca National Park is a large block of Atlantic Forest rising from central Rio de Janeiro, with granite peaks, waterfalls, old coffee-estate ruins, and the statue of Christ the Redeemer on its slopes. Most of the forest is not original. It was cut for coffee, sugarcane, and fuel in the 18th and early 19th centuries, then deliberately replanted to protect the city's water supply, making it one of the best-known examples of urban forest restoration in the world. Its animals were later lost and are now being returned one species at a time.

The Tapajós River: A Clearwater Giant Under Pressure

The Tapajós is one of the Amazon's largest tributaries and a major clearwater river. It forms in west-central Brazil where the Juruena and Teles Pires rivers meet, then flows north and northeast to join the Amazon River. Its basin covers the Amazon's southern edge, where ancient crystalline rock, rainforest and the northern margin of the Cerrado meet. The river carries Indigenous homelands, some of the Amazon's most active gold-mining frontier, a rapidly growing soy and corn waterway, and a long list of planned dams.

Alter do Chão and Santarém: Where the Tapajós Meets the Amazon

Alter do Chão is a village in western Pará, where the clear waters of the Tapajós River meet a white-sand shoreline and the Amazon forest. Each dry season, the river retreats, exposing long freshwater beaches that have earned the village the nickname "Amazon Caribbean." It also has deep roots: a Borari settlement before the Portuguese arrived, a Jesuit mission, a river port in the rubber era, and home to the Sairé, one of the Amazon's oldest folk festivals. Today it faces the pressures common to the region, including drought, fire, and land speculation.

The Federal District of Brazil: Capital Territory on the Highland Divide

The Federal District (Distrito Federal) surrounds and includes Brasília, and it is unlike any other political unit in Brazil. At 5,760 km², it is the country's smallest federal unit, yet it is home to about 2.8 million people as of the 2022 census, has the highest per-capita income in Brazil, and houses the three branches of the national government. It is neither a state nor a municipality but a hybrid that exercises both powers, set on a Cerrado plateau where the headwaters of three major river basins divide.

Brasília: A Modernist Utopia in the Heart of Brazil

Brasília is Brazil's federal capital and the seat of its government. Founded in 1960 on a high plateau in the Brazilian Highlands, it was built from scratch in just 41 months to move the country's center of power inland from the coast. Designed by Lúcio Costa and Oscar Niemeyer, it is one of the most ambitious planned cities of the twentieth century and has been a UNESCO World Heritage Site since 1987. The capital is the center of the Federal District, home to about 2.8 million people, and is the third-largest city in Brazil.

Rio de Janeiro: Urban Splendor Between Mountain and Sea

Rio de Janeiro is Brazil's best-known city and the capital of the state that shares its name. It lies on the Atlantic coast at the entrance to Guanabara Bay, where steep granite peaks, tropical forest, and long white beaches meet in a single city of 6.2 million people, with nearly 14 million in its metropolitan area. It was the capital of Portuguese Brazil, the Brazilian Empire, and the Republic until 1960, and it remains the country's second-largest city by population and its leading international destination.