Cuevona de Cuevas is a natural tunnel or cave of 300 meters long which is located in Junco, belonging to the municipality of Ribadesella (Asturias). It is a route of great landscaping beauty and as a natural path was enabled in the past by the locals, and this road was modernized later with asphalt, constructing a true highway for vehicles and pedestrians. The cave is perfectly illuminated for the passers-by and to highlight the attractive geological formations.