 The Autonomous Community of Cantabria comprises the single province of Cantabria (formerly Province of Santander).It was part of the Kingdom of Castile from the early days of that kingdom, being known outside the territory as "La Montaña" ("The Mountain"), and providing Castile's only outlet to the northern coast.Geographically, however, Cantabria was isolated from Castile and contrasted with it in many ways; the primary division between Cantabria and the rest of Castile was more geographic than political or ideological.