Ermionida () is a municipality in the Argolis regional unit of the Peloponnese in Greece. The seat of the municipality is the town Kranidi. The municipality has an area of 421 km2.
Municipality The municipality Ermionida was formed at the 2011 local government reform by the merger of the following 2 former municipalities, that became municipal units: Ermioni Kranidi
Province The province of Ermionida () was one of the three provinces of Argolis Prefecture. It was abolished in 2006. Its territory covered the territory of the present Ermionida municipality.
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