Aiara BTT Marathon

The Aiara BTT Marathon is a mountain bike marathon held each summer in the Ayala Valley of Álava in the Basque Country, organised by the local Aiarateam Atsport club. Recent editions have hosted the Euskadi XCM championship and use the trails around Mount Babio and the Sierra Salvada above Amurrio. Riders typically choose between a long marathon distance and a shorter half-marathon loop, both starting and finishing in Amurrio. The 2026 edition is scheduled for 28 June.