Lemnos is one of the regional units of Greece. It is part of the region of North Aegean

North Aegean

The North Aegean is one of the thirteen regions of Greece. It comprises the islands of the north-eastern Aegean Sea, except for Samothrace, which belongs to the region of East Macedonia and Thrace, and Imbros and Tenedos which belong to Turkey....

. The regional unit covers the islands of Lemnos

Lemnos

Lemnos is an island of Greece in the northern part of the Aegean Sea. Administratively the island forms a separate municipality within the Lemnos peripheral unit, which is part of the North Aegean Periphery. The principal town of the island and seat of the municipality is Myrina...

, Agios Efstratios

Agios Efstratios

Agios Efstratios or Saint Eustratius is a small Greek island in the northern Aegean Sea about 30 km southwest of Lemnos and 80 km northwest of Lesbos...

 and a few smaller, uninhabited islands, in the Aegean Sea

Aegean Sea

The Aegean Sea[p] is an elongated embayment of the Mediterranean Sea located between the southern Balkan and Anatolian peninsulas, i.e., between the mainlands of Greece and Turkey. In the north, it is connected to the Marmara Sea and Black Sea by the Dardanelles and Bosporus...

.

Administration

As a part of the 2011 Kallikratis government reform, the regional unit Lemnos was created out of part of the former Lesbos Prefecture

Lesbos Prefecture

Lesbos Prefecture was one of the prefectures of Greece. It consisted of three main islands: Lesbos itself, Lemnos, and the smaller island of Agios Efstratios. In 2011 the prefecture was abolished and the territory is now covered by the peripheral units of Lesbos and Lemnos...

. It is subdivided into 2 municipalities. These are (number as in the map in the infobox):

• Lemnos
  Lemnos
  Lemnos is an island of Greece in the northern part of the Aegean Sea. Administratively the island forms a separate municipality within the Lemnos peripheral unit, which is part of the North Aegean Periphery. The principal town of the island and seat of the municipality is Myrina...
  
   (3)
• Agios Efstratios
  Agios Efstratios
  Agios Efstratios or Saint Eustratius is a small Greek island in the northern Aegean Sea about 30 km southwest of Lemnos and 80 km northwest of Lesbos...
  
  (2)