Garrison Border Town of Elvas and its Fortifications

The Garrison Border Town of Elvas comprises twelve forts arranged in an irregular polygon formation, utilizing the surrounding hills as part of the defensive strategy. The interconnected system features ramparts, bastions, and dry ditches that completely encircle the town.

The fortification system developed during the 17th century and proved critical in defending Portuguese independence during the War of Restoration against Spanish forces. Multiple successful sieges demonstrated the effectiveness of its defensive design and protected the region throughout the conflict.

The fortified garrison reflects Dutch military science blended with local Portuguese building practices, visible in its geometric walls and defensive structures. Visitors can observe how these principles shaped the layout of bastions and connecting ramparts throughout the site.

The Amoreira Aqueduct supplied water to the garrison during long sieges and remains a striking structure with its four-tiered design. The entire fortification is accessible on foot, with the surrounding hills offering good vantage points to understand the complete defensive layout.

The fortification system ranks as the world's largest bulwarked dry-ditch network and cleverly repurposed former churches and monasteries for military use. This transformation of religious buildings illustrates the intensity of resource allocation during the period of conflict.