The Roman Bridge of Vila Formosa (Ponte de Vila Formosa) crosses the Seda stream, close to the village of Seda, in the municipality of Alter do Chão, in the Portalegre District of Portugal.

[1][2] The bridge was part of a Roman road that connected Lisbon to Mérida in Spain.

Stone pillars support six 8.95 metre-wide arches, each with 33 voussoirs.

The bridge was constructed with portico-shaped eyeholes between the arches to prevent the structure from collapsing during floods, a common practice for Roman bridges.

[1][2][3][4] The bridge, which is believed to have been constructed at the end of the 1st century CE, was classified as a National Monument on 16 June 1910.