Poseidonia

Poseidonia
Ποσειδωνία
Location within the regional unit
Poseidonia
Coordinates: 37°23′N 24°53′E / 37.383°N 24.883°E / 37.383; 24.883
CountryGreece
Administrative regionSouth Aegean
Regional unitSyros
MunicipalitySyros-Ermoupoli
Area
 • Municipal unit23.7 km2 (9.2 sq mi)
Population
 (2021)
 • Municipal unit
4,114
 • Municipal unit density174/km2 (450/sq mi)
 • Community
967
Time zoneUTC+2 (EET)
 • Summer (DST)UTC+3 (EEST)
Vehicle registrationEM

Poseidonia (Greek: Ποσειδωνία, romanizedPosidonía, 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. The population was 4,114 inhabitants at the 2021 census, and the land area is 23.705 km². The municipal unit shares the island of Syros with the municipal units of Ano Syros and Ermoupoli. It is also known as Dellagrazia (name taken from a small church of Maria della Grazia).