Tracing the giant river from its origins, high in the Andes, to its end, where it meets the sea on Brazil's Atlantic coast, Parry stays with the many and varied tribes who are desperately trying to maintain their way of life in a rapidly disappearing landscape.

Wildlife cameraman Gordon Buchanan travels to the remotest regions on three continents to join three tribal families, learning their unique traditional survival skills and how they live alongside the world’s most iconic and dangerous animals.

In the furthest corners of the planet, indigenous groups lead radically different lives. Bruce Parry visits three tribal communities who have never had outsiders to stay before.