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The medieval city walls surrounded the Old Town. The landward side was protected by the River Paillon, which was later covered over and is now the tram route towards the Acropolis. The east side of the town was protected by fortifications on Castle Hill. Another river flowed into the port on the east side of Castle Hill. Engravings suggest that the port area was also defended by walls. Under Monoprix in Place de Garibaldi are excavated remains of a well-defended city gate on the main road from Turin.[citation needed]