Which river on this list ends in the Mediterranean?

✓ El Júcar

The Júcar rises in the Serranía de Cuenca and flows into the Mediterranean Sea, at Cullera, in Valencia. The Tajo and Duero rivers flow into the Atlantic Ocean, in Portugal. The longest river that flows into the Mediterranean is the Ebro. Useful rule: almost all the big rivers of the peninsula, except the Ebro and some smaller ones like the Júcar or the Segura, go to the Atlantic.