Greek Islands
The islands(Greek island) are Greece’s chief morphological trait and an integral part of the country’s  civilisation and tradition. The Greek territory comprises 6,000 islands and islets scattered in the Aegean and Ionian Sea, a truly unique phenomenon on the European
 continent; of these islands only 227 are inhabited.The Greek Aegean sea takes up 7,500 km of the country’s total 16,000-km coastline,
 offering a highly diversified landscape: beaches stretching along many kilometers, sheltered bays and coves, golden stretches of sand with dunes, pebbly beaches, coastal  caves with steep rocks and black sand typical of volcanic soil, coastal wetlands... Many
 Greek beaches have been awarded the blue flag under the programme Blue Flags of Europe . Apart from swimming, they lend themselves to scuba diving, snorkeling, water skiing, sailing and windsurfing. As they are the cradle of some of the most ancient andprosperous European civilisations ( Cycladic, Minoan civilisations, etc.), all the islands  boast unique archaeological sites, an outstanding architectural heritage and  centuries-old, fascinating local traditions of a multifaceted cultural past. Moreover, 58.5% of the country’s lodging establishments and 62.6% of Accommodations  are found on the islands {data 2006 by travel page in Greece}. All the above, combined with the ideal  climate, the safety of Greek waters and the short distances between ports and coasts, have rendered the Greek  islands extremely popular among Greek and  visitors. Most islands lie in the Aegean Sea and are divided in seven groups :

 Sporades islands: Alonissos, Skiathos, Skopelos, Skyros  Evia (http://www.travelpage.gr/greece/Evia_and_the_Sporades.htm)
 Argo-Saronic Islands: Angistri, Aegina, Poros, Salamina, Spetses, Hydra and the
coastal area of Methana(http://www.travelpage.gr/greece/Saronic_Islands.htm).
Aegean Islands: Agios Efstratios, Thasos, Ikaria, Lesvos, Limnos,
Inousses, Samos, Samothrace, Chios, Psara.( http://www.travelpage.gr/greece/North-Eastern_Aegean_Islands.htm ) 
Cyclades islands : A group of 56 islands, its most important ones being Amorgos, Anafi, Andros, Antiparos, Delos, Ios, Kea, Kimolos, Kythnos, Milos, Mykonos, Naxos, Paros, Santorini, Serifos, Sikinos, Sifnos, Syros, Tinos, Folegandros, as well as the “Minor
 Cyclades” comprising Donousa, Irakleia, Koufonisia and Schinoussa.(http://www.travelpage.gr/greece/Cyclades.htm) 
 Dodecanese islands : Astypalaia, Kalymnos, Karpathos, Thasos, Kastelorizo, Kos, Lipsi, Leros, Nisyros, Patmos, Rhodes, Symi, Tilos, Halki(http://www.travelpage.gr/greece/Dodecanese.htm).
Crete island composed from the following regions Heraklion,Chania,Retymno and Lasithi
(http://www.travelpage.gr/greece/Crete.htm)
The Ionian Islands: Zakynthos, Ithaca, Corfu, Cephallonia, Lefkada, Paxi, Antipaxi, Ereikoussa, Mathraki, Meganissi, Othoni, Strofades.These islands, together with Kythira, which is however cut-off from the rest, opposite  the southern Peloponnese (next to Lakonia), as well as neighbouring Antikythira, they constitute the Eptanissa(http://www.travelpage.gr/greece/Ionian_Islands.htm).