The Autumn Walk of Baix Set is a non-competitive walk held in Montoliu de Lleida, Lleida, Catalonia. It offers various routes with different distances and difficulty levels, suitable for everyone, from families to experienced athletes. The event has a charitable component, collaborating with social organizations such as Aspros and the Food Bank. Registration is done in advance, both online and in person at the town halls of Montoliu and Sudanell. The use of reusable cups and the avoidance of waste generation in the natural environment are encouraged. The organization does not set a participant limit, and the registration fee is affordable. The route explores the landscapes of the Set River and its surroundings, including orchard areas, riverside forests, and dryland plateaus, with routes varying in length and difficulty to accommodate different effort levels. The walk is part of the Marxa.cat project, which promotes healthy lifestyle habits and knowledge of the natural environment.