THE WATERSHEDS OF SPAIN

Watersheds are the dividing lines of mountain ranges.
They are areas of land which descend from high ridges.
Rivers on the same watershed flow into the same sea.
Spain has three main watersheds:

• The Cantabrian watershed has short, fast-flowing rivers. Their flow is abundant and regular: the Nervion, the Saja, the Navia and the Nalon.
• The Mediterranean watershed occupies about one third of Spain. The rivers are short, with the exception of the Ebro. Their flow is irregular: the Ebro, the Jucar and the Segura.
• The Atlantic watershed occupies over half of Spain. The flow of the rivers is abundant and regular: the Miño, the Duero, the Tagus, the Guadiana and the Guadalquivir. The Tagus is the longest river in Spain.