Castile-Leon (Spanish: Castilla y León) is an autonomous region of Spain. It is composed of two regions, León (provinces of León, Zamora and Salamanca) and Castile (provincies of Avila, Burgos, Palencia, Segovia, Soria and Valladolid).
Castilla y León is an autonomous community of Spain, the country's largest — in fact, it is the largest subnational political division in the European Union. It is formed by the union of two ancient kingdoms: Old Castile and the Kingdom of León, which were separated and reunited several times in the Middle Ages.
Spanish is the main language, everybody in Castile-Leon speak Spanish, but in the provinces of León, Zamora and some parts of Salamanca the Leonese langauge, "llïonés", is also spoken by a little minority, along with Galician. In Treviño (Burgos province) Basque is still preserved.