Building on a family legacy of exploration and environmental filmmaking, director Céline Cousteau journeys to the Brazilian Amazon at the request of tribal leaders in order to bear witness to the indigenous communities' fight for survival. Cousteau shares their rarely seen stories of cultural pride and traditional way of life set against the legacy of colonialism, and documents the ever-present threats to their land and health crises triggered by contact with outsiders. Tribes on the Edge follows these indigenous communities fighting to protect their home – a home that is critical to the ecological balance of our planet, and as a result...these communities protect us.