Cerro Las Naves and the streams of the Valdoncina Nature · Santovenia de la Valdoncina, Tierras de León, León Image of Santovenia de la Valdoncina, not of the place itself. A plateau of moorland and isolated rises crowned to the north by the hill of Las Naves, at 890 metres. It is drained by the Oncina, Valle and Fontanillas streams, all of them tributaries of the Bernesga. Photo: David Perez (CC BY 4.0) What to see and do in Santovenia de la Valdoncina