The Tagus River is the longest on the Iberian Peninsula and, in addition, it is the one that divides Portugal in two as it passes through this country and reaches Lisbon, where it finally empties into the Atlantic Ocean. In total, its length reaches 1.007 km. Other rivers shared between Spain and Portugal are the Duero, the Miño and the Guadiana. However, rivers such as the Vouga, the Sado and the Cávado are entirely Portuguese. You have all the information in: «Maps of Portugal«.
You have all the information in: "Maps of Portugal".