- Ebro River: The longest river in Spain, flowing through the northeast region and into the Mediterranean Sea.
- Guadalquivir River: Located in southern Spain, it flows through Andalusia and empties into the Atlantic Ocean.
- Tagus River: Passing through central Spain and Portugal, it's the longest river of the Iberian Peninsula and flows into the Atlantic.
- Guadiana River: Another river in southern Spain, flowing into the Gulf of Cadiz and forming the border between Spain and Portugal.
- Júcar River: Located in the eastern part of Spain, it flows into the Mediterranean Sea.
- Duero River: Flowing through north-central Spain and Portugal, it empties into the Atlantic Ocean.
- Minho River: Forms part of the border between Spain and Portugal and empties into the Atlantic.
- Segura River: Located in southeastern Spain, it flows into the Mediterranean.