Alto de l'Angliru

Alto de l'Angliru is Spain's steepest paved road, averaging 10% over 12.6 km with ramps hitting 23% at Cueña les Cabres. It is 40% steeper than the average climb on #2 Lagos de Covadonga, demanding 85% of riders walk sections. This route outperforms #3 Vía Verde de la Sierra in challenge, with a 1,200-meter elevation gain — triple its total ascent. Concrete data: the 23% section is 200 meters long, making it faster than the typical HC climb in terms of pure difficulty per kilometer. Weather averages 8°C in autumn.