Piraeus of social problems also emerged with the concentration of new populations in the suburbs of the old city, such as Nikaia, Keratsini, Drapetsona and Korydallos. The involvement of Greece in World War II came as a major setback to the city's progress. After the war, the city began its development once more, as damage to the port and the city were repaired and new additions took shape after 1955. Piraeus is now the third largest municipality in Greece; the city proper with its suburbs form the Piraeus urban area, which is incorporated in the Athens urban area, thus making Piraeus
Ethnikos Piraeus Water Polo Club The Barbarians and a composite European team including three Hungarian Olympic gold medalists. The competition took place from the 27th-30 December 2008, with gold going to The Barbarians. The women's team of Ethnikos has won 3 championship and 1 European cup (LEN Trophy). In current season, it plays in first division championship (A1 Ethniki). Ethnikos Piraeus Water Polo Club Ethnikos Piraeus Water Polo Club is the water polo team of Ethnikos Piraeus or Ethnikos OFPF ("National Club of Fans of Piraeus and Phalerum"). Ethnikos is one of the most successful water polo clubs in Greece. They have won a record