Lemnos or Limnos (Greek: Λήμνος; Ancient Greek: Λῆμνος) is a Greek island in the northern Aegean Sea. Administratively the island forms a separate municipality within the Lemnos regional unit, which is part of the North Aegean region. The principal town of the island and seat of the municipality is Myrina. At 477.583 square kilometres (184.396 sq mi), it is the 8th-largest island of Greece.