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Native name: Μακρόνησος
Kea (left) and Makronisos from the International Space Station
GR Makronissos.PNG
Coordinates 37°42′N 24°07′E / 37.70°N 24.12°E / 37.70; 24.12Coordinates: 37°42′N 24°07′E / 37.70°N 24.12°E / 37.70; 24.12
Archipelago None
Area 20 km2 (7.7 sq mi)
Highest elevation 281 m (922 ft)
Region South Aegean
Regional unit Kea-Kythnos
Population 5 (2001)
Postal code 840 02
Area code(s) 22880

Makronisos (Greek: Μακρόνησος, lit. Long Island), or Makronisi, is an island in the Aegean sea, in Greece. It is located close to the coast of Attica, facing the port of Lavrio. The island has an elongated shape, 13 km (8 mi) north to south, around 500 m (1,640 ft) east to west, and its terrain is arid and rocky. It is the largest uninhabited Greek island.[citation needed]

In ancient times the island was called Helena.

It is part of the Kea-Kythnos regional unit and in the municipality of Kea.

Today it is uninhabited but it was used as a prison island from the time of the Greek Civil War until the restoration of democracy, following the collapse of the Regime of the Colonels in 1974. Because of its history, it is considered as a monument of the civil war era; therefore the island and the original structures on it are protected from alteration.

The Kea Channel between Makronisos and neighbouring Kea was the site of the sinking, in 1916, of HMHS Britannic, sister ship of the RMS Titanic.


View of the island from Cape Sounion, Attica


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