Portaikos Bridge, Stone bridge in Pyli, Greece

Portaikos Bridge is a single-arch stone bridge over the Portaikos, 1.5 km east of Pyli on the Trikala–Arta road. Its semicircular arch spans 29 m and rises 30 m, the second-largest span among traditional bridges of Thessaly. The deck is 67 m long and 2.1 m wide, built of rubble masonry with a ledge of hewn sandstone.

The bridge was commissioned in 1514 by Bessarion, the Metropolitan of Larissa, and served as a key link between two regions. Until modern roads opened in the 1930s, it remained the main crossing in this area.

The bridge is also called Gefyri tis Portas or tou Agiou Vissariona, after the nearby Porta pass and the monk Bessarion who funded it before becoming Metropolitan of Larissa. Its single 29-metre arch made it the second-largest traditional bridge span in Thessaly, and until 1936 it was the only crossing between the Aspropotamos villages and the Thessalian plain.

The bridge sits near a modern road and can be easily reached when traveling in the region. Visitors should wear solid shoes as the surface can be uneven and crossing takes time to do safely.

The surviving inscription on the bridge records its construction in 1514. Its semicircular arch rises 30 metres, giving it the second-largest span among traditional stone bridges in Thessaly, after the bridge at Korakos, which Bessarion also funded.