ancient Iberus
River, northeastern Spain.
Rising in the Cantabrian Mountains and flowing 565 mi (910 km) in a southeasterly course to the Mediterranean Sea, between Barcelona and Valencia , the Ebro is the longest river wholly in Spain and the second longest in the Iberian Peninsula. It has the greatest discharge and the largest drainage basin of any Spanish river. It is navigable for only 15 mi (25 km) upstream from its delta.