The Nansa river rises in the Peña Sagra range and drops towards the Cantabrian Sea through one of the best-preserved valleys in Cantabria. The riverside walk follows its lower reach on foot, next to the water, between Muñorrodero and the Trascudia hydroelectric station, in Val de San Vicente.
It’s about 6.8 km each way (around 14 km return), almost entirely level, with barely 50 metres of ascent, along an easy path with stretches of wooden boardwalk and the odd short flight of steps cut into the rock. The route passes pools and signposted fishing stretches, small waterfalls and riverside woodland of ash, willow, beech and holm oak, with a picnic area near the station.
It’s one of the most rewarding routes in the area to do with children: little climbing, shade, and the river alongside you the whole way. Good footwear is worth having, though you won’t need boots. Anyone who’d rather not walk back can arrange a taxi from the far end.
It’s 30 minutes from Alles.
