Ermionida is a municipality in the Argolis regional unit, Peloponnese, Greece. The seat of the municipality is the town Kranidi. The municip…Ermionida is a municipality in the Argolis regional unit, Peloponnese, Greece. The seat of the municipality is the town Kranidi. The municipality has an area of 421 km². 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.