Cork oak grove of Boxu Nature · Allande, Narcea, Asturias A stand of cork oaks of 12.19 hectares on the southern slope of the Sierra de Muriellos, the largest and best preserved in Asturias; it was declared a natural monument by Decree 39/2002 of 4 April, within the Carondio and Valledor Protected Landscape. Photo: SITOMON (CC BY-SA 4.0) What to see and do in Allande