La Sobanuca is a mountain march in the Valle de Soba, municipality of Soba, Cantabria. Walkers, runners, and cyclists participate within the same event framework. It takes place in October with several route options: a 9.41 km Short Walk, an 18.53 km Long Walk, an 18.53 km run, and a 22.2 km bike route.
The format resembles a local mountain day rather than a single competitive start. Families can select the shorter walk, runners can opt for the longer distance on foot, and cyclists have a dedicated route. Registration is available online or at the nor3 Turismo Activo offices. Early registration allows participants to choose their T-shirt size.