Diplomatic sources on US State Department report

In particular, they stated that as regards the Southeastern Aegean and the Eastern Mediterranean, the maritime borders have been defined by the Italy-Turkey Agreement signed in Ankara on 4 January 1932, as well as the minute which is an integral part of that agreement and was signed in Ankara on December 28, 1932. Greece, as the successor state, under the Treaty of Paris of 1947, gained sovereignty over the Dodecanese without any change in the maritime borders, as agreed between Italy and Turkey.

Regarding the sea borders in Thrace (up to the point at a distance of three nautical miles from the Evros Delta), they emphasise that these were defined by the Treaty of Lausanne of 1923 and the Athens Protocol of 1926.

Finally, regarding the sea borders between the above two areas (from Thrace to Dodecanese), where the territorial waters of Greece and Turkey intersect, they pointed out that the sea borders follow the middle line between the Greek islands and islets and the opposite Turkish coasts. 

The same diplomatic sources noted that Greece's external borders, including its territorial waters, are at the same time the external borders of the European Union.