WATERSHEDS OF SPAIN A watershed is an area where all the rivers and streams flow into the same area. There are three watersheds in Spain The Mediterranean watershed: The Cantabrian watershed: The Atlantic watershed: Is in the east and south Is in the north Is in the west The Mediterranean watershed It has short rivers with irregular flow regimes The longest rivers are: The Ebro: which rises in the Cantabrian Mountains The Jucar: which rises in the Iberian Mountain Chain. The Segura: which rises in the Subbetic Range The Cantabrian watershed has short rivers with abundant flows. The main rivers are: The Bidasoa, Oria and Nervion in the Basque Country The Pas, Nansa and Deva: in Cantabria. The Sella, Nalon and Navia in Asturias The Atlantic watershed is the largest in area. Its rivers are usually long. The rivers of Galicia: These rivers have an abundant flow and a regular flow regime. The Miño. The rivers of the Inner Plateau: These are the longest rivers on the Peninsula. The Duero, the Tagus and the Guadiana. The rivers of Andalusia: They are short and have irregular flow regimes. (With the exception of Guadalquivir) The gullies of the Canary Islands: They are deep channels where water flows when it rains heavily. The Angustias and Infierno gullies