R15 is a loop cross-country route that allows riders to explore all the sectors of the Zona Alfa MTB Centre, starting from the vicinity of La Robla. The route comprises a combination of forest tracks and short stretches of asphalt. It is an excellent choice for accessing the trails in the Alcedo/Llombera sector from La Robla. Additionally, it serves as a great option for those wishing to visit the breathtaking Corta Pastora/Santa Lucía open pit mine or reach the trailheads in the La Pola de Gordón sector, with the option to return to La Robla following the course of the Bernesga river. The route passes through the villages of Alcedo de Alba, Llombera, La Pola de Gordón, Nocedo, Peredilla, and Puente de Alb in a counter-clockwise direction.
