Forced from their homes by missionaries, the Ayoreo cling on in the Chaco. Now the Bioceanic Corridor cuts through the fastest-vanishing forest on Earth, refuge of some of the Americas’ last hunter-gatherers

In 1972, Catholic missionaries entered the Chaco forest of northern Paraguay and forced Oscar Pisoraja’s family, and their nomadic Ayoreo people, to leave with them. Many perished from thirst on the long march south. Settled near the village of Carmelo Peralta on the Paraguay River, dozens more died from illnesses. Still, the survivors kept up some traditions – hunting for armadillos; weaving satchels from the spiky caraguatá plant. “We felt part of this place,” says Pisoraja, now 51.

Today, his community – and other indigenous peoples across the Chaco, a tapestry of swamp, savanna and thorny forest across four countries that is South America’s largest ecosystem after the Amazon – are confronting a dramatic new change.

Mario Abdo Benítez, Paraguay’s president, and Reinaldo Azambuja Silva, governor of Mato Grosso do Sul state in Brazil, at the site of a new bridge across the Paraguay River, due to be completed in 2024