Potidaea

Potidaea (/ˌpɒtɪˈdiːə/; Greek:Ποτίδαια, Potidaia) was a colony founded by the Corinthians around 600 BC in the narrowest point of the peninsula of Pallene, the westernmost of three peninsulas at the southern end of Chalcidice in northern Greece.

While besieged by the Persians in 479 BC, the town was saved by the earliest recorded tsunami in history. Herodotus reports how the Persian attackers who tried to exploit an unusual retreat of the water were suddenly surprised by "a great flood-tide, higher, as the people of the place say, than any one of the many that had been before". In 2012 researchers from Aachen University announced that they had discovered evidence that supported the account of Herodotus and that the area should be included among Greek regions prone to tsunamis.