Muniellos Strict Nature Reserve Nature · Cangas del Narcea, Narcea, Asturias It protects 59.7 square kilometres spread between Cangas del Narcea and Ibias and preserves the largest oak forest in Spain and one of the best preserved in Europe. It comprises three mountains, Muniellos, La Viliella and Valdebois, with altitudes ranging from 680 metres to the 1,640 of the pico de la Candanosa; on the mountain of Muniellos rises the short river of the same name, a tributary of the Narcea. Unesco declared it a biosphere reserve in 2000, and in 2002 it became a strict nature reserve within the natural park of las Fuentes del Narcea, Degaña e Ibias. Visits, limited to twenty people a day, must be authorised by the Consejería de Medio Ambiente of the Principado de Asturias. Photo: Tanja Freibott (CC BY-SA 3.0 es) What to see and do in Cangas del Narcea