Frías is a town located in the northern part of the province of Burgos, in Castile and León, Spain. In 2010 it had a population of only 275 inhabitants.
Frías is a historic medieval town on a hill above the river Ebro, which has been a strategic point to cross river Ebro in the routes communicating with the Cantabrian Sea. Today the town is a popular tourist spot. It has an impressive castle dominating the river and the twelfth-century bridge across it. It is considered to be the smallest "city" in Spain, having been given that title in 1435.
The Ebro (Spanish and Basque [ˈeβɾo]; Catalan: Ebre, Western:[ˈeβɾe], Eastern:[ˈeβɾə]) is a river of the north and northeast of the Iberian Peninsula, in Spain. It rises in Cantabria and flows 930 kilometres (580 mi), almost entirely in an east-southeast direction. It flows into the Mediterranean Sea, forming a delta in the Terres de l'Ebre region, in southern Catalonia. In the Iberian peninsula, it ranks second in length after the Tagus and second in discharge volume, and drainage basin, after the Douro. It is the longest river entirely within Spain; the other two mentioned flow into Portugal.
