Friera Peak Nature · Illas, Avilés, Asturias Image of Illas, not of the place itself. Also called Bufarán, at 623 metres it is the roof of Illas and commands a territory of steep gradients between Avilés and the interior. In 1954 a military aircraft crashed on its slopes, killing four airmen. Photo: Denis Soria (CC BY-SA 3.0) What to see and do in Illas