Iruña Oka-Iruña de Oca
Declared a Monumental Site in 1984.
The bridge lies in the town of Trespuentes, constructed on the Zadorra river bed.Built of irregular masonry, with thirteen vaults supported on twelve pillars and two lateral buttresses.It appears to be of Roman origin, but the structure belongs to the 16th century.
- Construction: Bridge
- Artistic period: Renaissance
- Historic period: Romanisation (A.D.)