Pajares Pass Nature · Lena, Caudal, Asturias Image of Lena, not of the place itself. The Pajares pass, a crossing of the Cantabrian mountain range at 1,378 metres between Pajares and Arbas del Puerto, separates Asturias from the province of León. It is known for its winter snowfalls, its fog on summer nights and its gradients, which officially reach 17%, as well as for the nearby Valgrande-Pajares ski resort. The N-630 road runs through it, which together with the León-to-Gijón railway line makes it a key communication route between Asturias and central Spain; the road and the railway follow the same natural crossing, through the valleys of the Pajares river on the Asturian side and of the Bernesga on the León side, although the railway does not cross the top of the pass, instead crossing the range lower down through the Perruca tunnel. Photo: Xuliu Pombar (CC BY-SA 4.0) What to see and do in Lena