Asturias is located on the Cantabrian Sea, part of the Atlantic Ocean, in the north of Spain and has an area of 10,603.57 km². It is bordered to the west by Galicia, to the east by Cantabria and to the south by Castile and Léon. The Asturian coast is also known as the Costa Verde. The Cantabrian Mountains, of which the Picos de Europa are part, lie parallel to the coast along its entire length. The fact that this mountain range is close to the coast is very decisive for the landscape. For example, the rivers in Asturias are quite short, with a large height difference and therefore with a very strong current.