Aigosthena was a fortified port city in Megaris, about 19 kilometers northwest of Megara, to which it belonged. It lies on the Alkyonides Gulf, an inlet of the Gulf of Corinth. The site had an acropolis citadel on a low hill about 450 meters from the sea, plus a lower town, and two walls linked it to the sea. The citadel was roughly trapezoidal, about 90 by 187 meters, and eight towers were built into its perimeter wall. The northern sea wall survives for about 370 meters.
Dating is debated. One scholar proposes fortification after 370 BCE, while another favors the late fourth century BCE. The site was under the Achaean League from 243 to 224 BCE. A five-aisled Christian basilica was later built in the lower fortified area.
The modern village, also called Porto Germeno, is a beach resort with a small port.
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