This 38-kilometre stage with an elevation gain of 347 metres runs from La Pola de Gordón to Puente de los Fierros (in Lena), through a transitional landscape between León and the Principality of Asturias. The route gradually rises, with constant but not overly demanding climbs, making it accessible to riders with some experience.

The route mainly runs along minor and main roads with moderate traffic, through mountainous landscapes, forests, and small villages that mark the rural character of northern León and southern Asturias. The route gains altitude steadily, preparing the cyclist for the ascent towards the Pajares mountain pass, although it is not reached on this stage.

As you approach Puente de los Fierros, the route enters more wooded areas, with a marked Atlantic influence on the landscape. It is a stage that combines sport with landscape, ideal for anyone looking to enjoy the scenery along the way.

This 38-kilometre stage with an elevation gain of 955 metres links Puente de los Fierros (Lena) with La Pola de Gordón through one of the most spectacular transition zones between Asturias and León. Despite the considerable height reached, the route profile does not feature long, technical ramps but rather a continuous succession of climbs that require endurance rather than technical skill, which justifies its classification as of moderate difficulty.

The route runs along low-traffic minor roads in a mountainous setting, with dense forests and charming villages that reflect the nature of the countryside of Asturias and León. The physical effort required is offset by the stunning landscapes, especially on the higher stretches, where panoramic views over the valleys and ridges of the Cantabrian Mountains can be enjoyed.

As you make your way towards León, the scenery opens up, the slopes become gentler, and the route becomes easier to ride, ending at La Pola de Gordón. It is quite a demanding but rewarding day for riders who enjoy high mountain biking.