Cyclades Islands entered Greek sovereignty in 1833. The Cyclades is an island group in the Aegean Sea, southeast of mainland Greece and constitutes one of the administrative entities of Greece. In terms of administration they are divided in 9 provinces, 20 municipalities and 11 communities. They form one of the island groups which constitute the Aegean archipelago. The Cyclades comprise about 220 islands, the major ones being Amorgos, Anafi, Andros, Antiparos, Ios, Kea, Kimolos, Kythnos, Milos, Mykonos, Naxos, Paros, Folegandros, Serifos, Sifnos, Sikinos, Syros, Tinos, and Thera or Santorini. Most of the smaller islands are uninhabited. Ermoupolis city (37°27N 24°54E), on Syros, is the capital and administrative center of the prefecture. The islands are peaks of a submerged mountainous terrain, with the exception of two volcanic islands, Milos and Santorini (Thera). The total area of the islands is 2572 km² with 120000 inhabitants.