Fragthi Cave constitutes one of the most famous and important caves not only in Greece but in Europe as well. It is a unique cave overlooking the Argolic Gulf opposite of Koilada village in southeastern Argolis.

Catafiki Canyon is situated in the northwestern part of Ermioni and it is a natural connection between Hermione and Fourni.

Thermisia Lagoon is located next to the traditional village Thermisia, in the eastern part of Ermione. It was named after the hot springs which existed in the specific area. This is the place where geographer Pausanias reports the existence of a temple devoted to goddess Thermisia Demeter.