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Poseidonia is located in Greece
Coordinates: 37°23′N 24°53′E / 37.383°N 24.883°E / 37.383; 24.883Coordinates: 37°23′N 24°53′E / 37.383°N 24.883°E / 37.383; 24.883
Country Greece
Administrative region South Aegean
Regional unit Syros
Municipality Syros-Ermoupoli
 • Municipal unit 23.7 km2 (9.2 sq mi)
Population (2011)[1]
 • Municipal unit 3,893
 • Municipal unit density 160/km2 (430/sq mi)
 • Population 928 (2011)
Time zone EET (UTC+2)
 • Summer (DST) EEST (UTC+3)
Vehicle registration EM

Poseidonia (Greek: Ποσειδωνία, named after Poseidon) is a village and a former municipality on the island of Syros, in the Cyclades, Greece. Since the 2011 local government reform it is part of the municipality Syros-Ermoupoli, of which it is a municipal unit.[2] The population was 3,893 inhabitants at the 2011 census, and the land area is 23.705 km².[3] The municipal unit shares the island of Syros with the municipal units of Ano Syros and Ermoupoli. Also known as Dellagrazia (name taken from a small church Maria Della Grazia).


  1. ^ a b "Απογραφή Πληθυσμού - Κατοικιών 2011. ΜΟΝΙΜΟΣ Πληθυσμός" (in Greek). Hellenic Statistical Authority. 
  2. ^ Kallikratis law Greece Ministry of Interior (in Greek)
  3. ^ "Population & housing census 2001 (incl. area and average elevation)" (PDF) (in Greek). National Statistical Service of Greece.