The Pantanal, the world's largest wetland, spreads across the borderlands south of the Amazon basin, and this film spends its runtime with the people, animals, and plants that depend on it. The Pantaneiros are cattle herders whose way of life echoes Spanish transhumance traditions, working with the pantaneira cow and horse, breeds now nearly extinct and kept going largely through this close, working relationship. The film also follows a man identified as one of the last of the Watoto, living alone off jacares, capybaras, and piranhas pulled from the marsh itself. Cameras record rock paintings in the region for what the film presents as the first time they have been filmed, adding an archaeological thread to the ecological one. Throughout, the camera traces the river system that feeds into the Amazon, tying the wetland's cycles of flood and drought to the larger river without which, the film argues, the wider natural cycle could not complete itself. It is a portrait of a landscape held together by water, cattle, and a handful of people who still live by its rhythms.