In a hybrid style that intertwines political essay and road movie, this documentary by Santiago Bertolino takes us to the heart of Amazonian reality. Following Marie-Josee Beliveau, an ecologist and ethnogeographer, they travel together the 4,000 km that separate the mouth of the Amazon River in Brazil from one of its sources in Ecuador to meet the guardians of the forest. The result is powerful and spontaneous testimonies from local communities ready to do anything to save what remains of their lands that are disappearing in the face of the inexorable advance of Western modernity.