Mountain range of Gistredo y el alto de la Cañada Nature · Riello, La Montaña de Luna, León Image of Riello, not of the place itself. The municipality is closed off to the north and east by the sierras of La Filera and Gistredo, where the Alto de la Cañada reaches 2,157 metres and the Cueto Agudo 1,884, the high point of Riello's thirty-nine villages. Photo: David Perez (CC BY 3.0) What to see and do in Riello