Sierra de la Demanda Greenway Nature Trail

The Nature Trail, which follows an old mining railway line, starts at Arlanzón's sports centre and continues east on a gravel road 2.5 to 3 metres wide. It crosses the bridge over the River Arlanzón, and heads towards a water treatment plant, past a flat oak (Quercus sp.) forest.

After passing through another oak forest with centenary trees and pasture lands, the route crosses a firebreak and ventures into a reforestation Scots pine (Pinus sylvestris) forest studded with a few oaks.

As the Trail winds through flat terrain, the mixed forest gives way to pastures. After crossing the road to Urrez, the route ventures again into a dense oak forest. Before reaching a signposted intersection, there is a small pond carpeted with water lilies (Nymphaea sp.) and a few debarked oak logs. The route continues straight ahead, and passes next to a larger lagoon where the oak groves are dotted with beeches (Fagus sylvatica).

In the next stretch, the Trail drifts away from the railway line, and winds up a steep slope to an intersection. Here, the route continues to the left towards another crossroads, where it again takes the left fork. The Nature Trail is now on flat terrain and follows again the old railway line.

The route descends through the forest, crosses a stream, and climbs again through a pine forest with two firebreaks. It reaches the edge of the reservoir and skirts along the left side at half-slope, through pine and oak groves.

It then crosses an iron and wooden bridge over a stream that flows into this reservoir, and continues along the edge to the tail end. From here, the route continues uphill through meadows, until Pineda de la Sierra ski resort, from where Picos de la Demanda is visible.

Heading straight ahead at the next two intersections, the Trail reaches a chapel situated at a crossing, opposite Pineda de la Sierra. The route continues between the town states until it reaches Bu-820 road, that is crossed.

From here, the Nature Trail runs along the river through a riparian birch (Betula sp.) and beech forest. After crossing the river several times by small bridges, it passes an oak grove and continues through heathland studded with beech groves, until it reaches an intersection where the route climbs a steep slope, leaving the tunnel of the old railway line to the left. Once at Manquillo mountain pass (1,400 m), the route descends to Barbadillo de Herreros, after a brief stop to enjoy the best scenic views of the valley on this route.

The next stretch runs up a steep slope to the southeast, towards the tunnel exit, and continues across flat terrain with thick oak groves and a few beeches in the shadier areas. It follows the route of the old railway line until it intersects the road that comes from the mountain pass.

After a few kilometres, the town of Riocavado de la Sierra can be seen through the clearings in the forest. The houses of Barbadillo de Herreros appear further on. The road then passes through a lighted tunnel and crosses the road again to continue through an oak grove towards Bezares. After passing a small pond, the route opens onto vast meadows.

The Trail continues through several intersections to finally reach the small town of Bezares. It winds through meadows and crosses a small road, before heading into Las Aceras forest, populated with large tree species typical of Atlantic forests, including beeches and oaks, pines, maples (Acer sp.) and hollies (Ilex aquifolium).

After climbing down a steep slope, the Nature Trail ends at La Pradera recreation area, a beautiful place near the village of Monterrubio de la Demanda, with a fountain, a small cottage and several tables under centenary oak trees, which invite a rest.