The Munduruku people live mainly in forest regions and riverbanks, in villages spread along the Tapajos River in the Brazilian states of Para, Amazonas and Mato Grosso. With an estimated population of 12,000 to 15,000 people, the Munduruku are the most numerous indigenous group along the free-flowing Tapajos River.

The dwellers of the Sawre Muybu Indigenous Land have sought for at least three centuries to officially demarcate their territory. The 178,000-hectare area includes rainforest that is threatened by illegal loggers and mining — and more recently, by the construction of reservoirs for hydropower.

Munduruku people live largely as they have for centuries. Villages are represented by women known as "cacicas." Maria Aniceia Akay Munduruku, from the upper Tapajos, has taken part in her people's movement against the construction of hydropower dams, including by demarcating indigenous land. She doesn't speak Portuguese: Her husband helps her to communicate with others outside the village.

The Tapajos River is the essence of life for the indigenous Munduruku people. They depend on its water for sustenance, and to get around. The waters teem with vitality — there are 324 identified species of fish living in the waters, beside Amazonian manatees and giant otters.

Along the river also live hundreds of species of birds, lizards and amphibians. Tapirs and giant anteaters ply the riverbanks, while jaguars and ocelot also prowl the rainforest and savannah. The region is among the world's most important for rare land and water species.

Munduruku children attend the village school, under the guidance of indigenous teachers. In this picture, girls play in the shared classroom at Sawre Muybu village during their holiday break. Animals such as monkeys, parrots, dogs and capybaras are welcome among the children.

Manioc flour is the staple food in Munduruku villages — cassava planted on the family farm is crushed, shredded and then roasted in a wood-burning stove. Also sweet potatoes, yams and bananas are grown. Although Munduruku consume mainly food grown in the local fields, items such as sugar, salt and coffee have also made their way into the traditional diet. They are purchased in town once a month.

An aerial view shows the Teles Pires dam, on the homonymous tributary to the Tapajos. The lighter green color indicates the area of forest that was submerged — critics point out that rotting vegetation from inundated forest produces considerable quantities of methane, a powerful greenhouse gas. The specter of ongoing drought also casts doubt on future usability of such hydropower stations.

This aerial image shows construction at the Sao Manoel hydropower dam, which is supposed to begin operation by January 2018. Partially funded by Chinese companies, the cost of the project is estimated to reach €600 million euros. The plant, located on the Teles Pires River, will have the capacity to generate 700 megawatts of electricity.

If built, the Sao Luiz do Tapajos dam would inundate this stretch of the river — including its shallows, rapids, beaches, waterfalls, inlets and shores. Once full, it would create a reservoir the size of New York City. Planned dams could flood up to 7 percent of indigenous territory, resulting in loss of land, poorer water quality and less fish — deeply affecting Mundukuru livelihood.