visitcorinthia.comThe Hexamilion Wall
The idea was both simple and enormous: if the Isthmus is the only narrow way into the Peloponnese, then sealing it seals the entire peninsula. That is exactly what the Hexamilion Wall set out to do.
The history
It was built in the early 5th century AD, under Theodosius II, running across the Isthmus from the Corinthian Gulf to the Saronic — some 7.5 kilometres of wall with towers at regular intervals and a strong fortress near Isthmia. Its name comes from its length, six miles.
The wall was repaired many times in the Byzantine period and rebuilt in the late Middle Ages as threats from the north returned. For all its bulk it was never enough: history went around it more than once.
What you will see
Substantial stretches survive, with the best-preserved part being the fortress beside Isthmia, where towers, gates and the sheer thickness of the masonry are clearly visible.
Practical notes
- The most accessible section is next to the archaeological site of Isthmia.
- See it together with the Sanctuary of Poseidon and the museum.
Scan to open the page with maps, photos and updates.
Printed on: 18/10/2026