Tagus River Source: Spain's Montes Universales

The Longest Iberian River Begins in Spain

The Tagus (Spanish: Tajo, Portuguese: Tejo) originates in the Montes Universales mountain range in east-central Spain (Teruel province).

Course Summary

1. Source: Montes Universales, Spain (~1,590 m elevation)
2. Upper Course: Westward through central Spain (Aranjuez, Toledo)
3. Border Section: Forms Spain-Portugal boundary
4. Lower Course: Southward through Portugal
5. Mouth: Atlantic Ocean at Lisbon, Portugal

Key Facts

• Length: 1,007 km (626 mi)
• Basin: 80,100 km²
• Major tributaries: Jarama, Alberche, Tiétar, Alagón, Zêzere
• Historical significance: Lisbon's harbor made it a gateway for exploration and trade

The Tagus is vital for water supply, irrigation, hydroelectricity, and cultural heritage in both nations.