The Sierra de la Culebra, Portuguese: Serra da Coroa, is a mountain range in Castile and León, northwest Spain, and northeastern Portugal. It lies 7 km south of Puebla de Sanabria in the comarcas of Aliste, Sanabria and La Carballeda (Zamora Province), as well as Vinhais and Bragança municipalities in the District of Bragança.