Tagus (
Latin Tagus,
Spanish Tajo,
Portuguese Tejo,
pron. ) is the longest
river on the
Iberian Peninsula. It measures 1,038 kilometers in length, 716 km of which are in
Spain, 47 km as border between
Portugal and Spain and the remaining 275 km in Portugal. It drains an area of 80,100 km² (the second largest in the Iberian peninsula after the
Douro). It follows a very constricted course for much of its length, but after
Almourol it enters a vast alluvian valley prone to flooding. Today the Alcantara Dam regulates much of the river's flow.
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