Piraeus (regional unit)Piraeus, also sometimes called Greater Piraeus, is one of the regional units of Greece. It is part of the region of Attica. The regional unit covers the west-central part of the Athens urban area.AdministrationAs a part of the 2011 Kallikratis government reform, the regional unit Piraeus was created out of part of the former Piraeus Prefecture. It is subdivided into 5 municipalities. These are:Keratsini-DrapetsonaKorydallosNikaia - Agios Ioannis RentisPeramaPiraeus