The Cantabrian Sea (Spanish: Mar Cantábrico) is the southern part of the Bay of Biscay in the Atlantic Ocean, on the north side of Spain and southwest of France, to be exact between the Estaca de Bares in Galicia and the mouth of the Adour near the city of Bayonne. This piece corresponds to the costa Cantábrica, at the foot of the Cantabrian Mountains (Spanish: Cordillera Cantábrica). Except in the Basque country, the name Mar Cantábrico in Spain is more common than the name of Golfo de Vizcaya ('Bay of Biscay') for this piece of the ocean.
The sea is located in a transition zone between the cooler seas of the north and tropical seas, due to the influence of the wave flow. Closer to the French coast, the seawater is warmer in summer (22-24 ° C) and colder in winter (10-12 ° C). The sea has an average salt content of 35%, but this may vary depending on weather. There is a strong tidal effect.
Due to a constant, windy northwest wind, caused by the lower air pressure above the British Isles and the high-pressure area that is often above the Azores, this coast regularly occurs 2.5 to 3 meters high. In spring and autumn, winds can rise from the west under certain circumstances (the Galerna), which can cause waves up to 9 meters high.
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