Chui, Rio Grande do Sul (Brazil) - "Extremo Sul". 226km of a tremendous sand plain, in an inhospitable, climatically unstable place with huge contrasts. 54 hours is the maximum time to cover the route between sand and sea, in a corridor that can sometimes seem endless and psychologically exhausting. This is a self-sufficient race between the various bases set up by the Organization. The longest beach in the world, in the far south of Brazil, linking Barra do Chui, in the municipality of Santa Vitória, to Cassino, in Rio Grande, is no ordinary beach. It's a world of stories, struggles, difficulties, overcoming, but also of knowledge, escape and a lot of transformation. www.horizontes.pt/extremo-sul