Castile and Leon is placed in the middle/northwest of Spain, and it's the largest autonomous community of Spain. Its vast terrain is composed mainly of dry expanses of land, and over 6 billion sq. feet are exclusively dedicated to vineyards. Castile and Leon is one of the parts of Spain with the best wines, with designations of origin like DO Ribera del Duero, DO Toro or DO Rueda. The second most important city in Castile and León is Salamanca, which houses the oldest university in Spain and one of the oldest in Europe.