Evia is the second largest island in Greece and the sixth largest in the Mediterranean. The area of the island is 3,654 sq km. and extends along the northeastern mainland of Central Greece, from the Maliakos Gulf to the coast of Rafina, separated from it by the sea of Evia.
The island complex of Petalioi is in the southern Evia gulf, between Marmari Evia and Rafina Attica. The islands of the complex comprise of Megalonisos, Chersonisi, Avgo, Lamperousa, Louloudi, Makronisi, Pontikoniso, Praso, Tragos and Founti.