Huerna River Nature · Lena, Caudal, Asturias Image of Lena, not of the place itself. It comes down from the pass of the same name through a narrow valley in the south of Lena and joins the River Pajares at Campomanes to form the River Lena. Its natural corridor is also that of the AP-66, the motorway known precisely as the Huerna motorway. Photo: Xuliu Pombar (CC BY-SA 4.0) What to see and do in Lena