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|Primary inflows||Agüera, Asón, Bidasoa , Cares-Deva, Eo, Escudo, Miera, Nalón, Nansa, Navia, Pas, Pisueña, Saja-Besaya, Sella, Piles|
|Basin countries||Spain, France|
|Max. length||800 km (497 mi)|
|Max. depth||2,789 m (9,150 ft)|
The Cantabrian Sea[a] is the coastal sea of the Atlantic Ocean that washes the northern coast of Spain and the southwest side of the Atlantic coast of France; it represents the south area of the Bay of Biscay. It extends from the cape Estaca de Bares in the province of A Coruña, to the mouth of the Adour river, near the city of Bayonne on the coast of the department of Pyrenees Atlantiques in French Basque Country.