The country is surrounded by the Ionian, the Aegean, the Libyan Sea and the Lykio Sea. The Aegean Sea contains numerous islands, including the island of Euboea, Lesbos, Rhodes and the islands of the Cyclades and the Dodecanese, while to the south you will find Crete, the largest Greek island and the fifth largest in the Mediterranean. South of Crete is Gavdos, the southernmost island of Greece and Europe. The main islands of the Ionian Sea are Corfu, Kefalonia, Lefkada and Zakynthos. Southeast, between Rhodes and Kastelorizo, lies Lykio Sea.
Greece has a coastline of 13,676 kilometres, which is considered very large, due to the extensive horizontal territorial dismemberment and the rugged terrain of the area, as well as the multitude of countless islands, which are more than 2,500 and are mainly the result of the collision of the African tectonic plate with the European. Its borders reach a length of 1,228 kilometres.