Makronisos ( , in Greek, lit. long island) is an island in the Aegean sea, in Greece and is located close to the coast of Attica, facing the port of Lavrio. It has an elongated shape (3km north to south, ca. 500 m east to west) and its terrain is arid and rocky. In ancient times. the island was called Helena. It is part of the prefecture of the Cyclades but it is not part of that island chain.

Currently it is uninhabited, however, during the Greek Civil War, it was used as a concentration camp for Greek communists, hosting hundreds of prisoners. Because of its history, it is considered as a monument of the civil war era; therefore the island itself and the original structures on it are protected from alterations.

HMHS Britannic was the third Olympic-class ship of the White Star Line, sister ship of the famous RMS Titanic and RMS Olympic

The straits between Makronisos and neighbouring Kea are the site where the HMHS Britannic, sister ship of the RMS Titanic, was sunk in 1916.



  • Longitude: 21.13 (21°7'53') E
  • Latitude: 37.694 (37°41'30') N

Postal code: 840 02
lowest: sea level
highest: 281 m
Dialing code: +30-22880 (030-22880)-34


Makronisos is another small island near Salamis

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