Archie Hayes 
The Tagus is the longest river on the Iberian Peninsula. It is 1,038 km long, 716 km in Spain, 47 km along the border between Portugal and Spain and 275 km in Portugal, where it empties into the Atlantic Ocean near Lisbon. It drains an area of 80,100 square kilometers (the second largest in the Iberian peninsula after the Douro). The Tagus is highly utilized for most of its course.
