Strabo

And Macedonia, of course, is a part of Greece.

— Strabo

The Aegean sea washes Greece on two sides: first, the side that faces towards the east and stretches from Sunium, towards the north as far as the Thermaean Gulf and Thessaloniceia, a Macedonian city...; and secondly, the side that faces towards the south, I mean the Macedonian country, extending from Thessaloniceia as far as the Strymon.

— Strabo

There remain of Europe, first, Macedonia and the part of Thrace that are contiguous to it and extend as far as Byzantium; secondly, Greece; and thirdly, the Islands that are close by. Macedonia, of course, is a part of Greece, yet now, since I am following the nature and shape of the place geographically, I have decided to classify it apart from the rest of Greece and to join it with that part of Thrace...

— Strabo