Possible Clues:

• Put a name to American river, longest in country
• Longest river on the Iberian peninsula
• Children's game gets you and me in river
• Children's game next to American river
• Portuguese River
• Current way to ensure we obey curfew?
• The longest river on the Iberian Peninsula
• Saying to ourselves: 'This is a very long river'
• River of Spain/Portugal
• River that's appreciated by good American