Travesía del Alto Duero is an 11-kilometer mountain race and walking march in Soria, starting and finishing in the city’s Plaza Mayor. Runners and walkers set off at 18:00, giving the event an evening feel rather than a morning start, and it is part of the Soria Puro Oxígeno mountain running circuit.
The route heads out through the Sierra de Santa Ana area, providing the race a short but clearly mountain-based format close to the city. It is organized by Banzaii Antártica Agrupación Soriana de Montaña, and recent editions have drawn around two hundred participants, enough to feel like a local gathering without turning into a huge mass race.