Possible Clues:

• Long Spanish river
• Aragon divider
• River of northeast Spain
• Long river of Spain
• Energy and vivacity when one's plucked Spanish flower
• River that ends in Tarragona
• River that was the ancient dividing line between Rome and Carthage
• River through Logroño and Aragon
• River taken to heart by the real Acton Bell!
• River past Logroño