Caso is a municipality in the Spanish Principality of Asturias. It shares a boundary to the North with Piloña; to the East with Ponga; to the South with León and to the West with Sobrescobio and Lavia

Laviana is a municipality in the Autonomous Community of the Principality of Asturias, located in Spain. It is bordered on the north by Bimenes and Nava, on the south by Aller, on the east by Piloña a