Piraeus (Greek: Περιφερειακή ενότητα Πειραιώς) 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 agglomeration of Athens.
As 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 (number as in the map in the infobox):
Nikaia-Agios Ioannis Rentis (7)
List of settlements in Attica
^ Kallikratis reform law textPDF
Medieval Greece / Byzantine Empire
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