Piraeus (Ancient Greek: Πειραιεύς) is a city, part of the Athens-Piraeus Urban Complex, “the third city in Greece after Athens and Thessaloniki” with its own regional urban area, and the seat of the most important port in Greece. The Municipality of Piraeus, according to the 2011 Census has an area of 10.9 sq. Km. and a population of 163,688 inhabitants (which makes it the fifth largest municipality in the country after the implementation of the “Kallikratis” program).
The wider area of Piraeus forms the Peripheral Unit of Piraeus, which consists of the homonymous municipality and four more municipalities (Nikaia-Agios Ioannis Rentis, Korydallos, Keratsini-Drapetsonas and Perama), with a total population of 44.4 and 99.7. km Occupies the southwestern part of the Capital Region.
The center of Piraeus is about 10 km from the center of Athens, which is a historic port.
Piraeus in modern times is an important industrial and commercial center of the country, being the largest passenger port in Europe, connecting the capital with the Aegean islands and being an important destination for cruise ships within the Mediterranean.