Kallion, Archaeological site in Dorida Municipality, Greece
Kallion was a fortified ancient city whose walls extended over about two kilometers and contained structures from the fourth and third centuries BCE. The ruins now lie beneath the waters of Lake Mornos, with only the acropolis remaining visible above the surface.
The city suffered major destruction in 279 BCE when Celtic peoples launched an invasion that devastated the settlement. It was rebuilt afterward but did not survive permanently into later periods.
The residents of Kallion traded with distant kingdoms and Greek city-states, as evidenced by hundreds of clay sealings discovered in a house archive. These objects show how important the settlement was to ancient trade networks.
Visitors can examine artifacts from Kallion, including pottery, coins, mosaics, and inscriptions, at the Archaeological Collection in Lidoriki. The site itself is difficult to reach, so viewing the collection first helps understand the city's story before attempting a visit.
The city sank beneath water when a modern dam was constructed, hiding most of its ruins from view. Only the fortified acropolis still rises above the lake surface, serving as a visible reminder of what once stood there.
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