"The Roman province of Macedonia lay in the northern part of GREECE and extended beyond the historic kingdom of Macedonia, from the Adriatic eastward to Thrace. To the north lay the provinces of Illyricum and Moesia. Southward it took in the area of Thessaly (and the mountainous range around Olympus). To the southwest of Macedonia was the region of Epirus, and to the south the province of Achaia. . . ."
David W. J. Gill, "Macedonia," in The new interpreter's dictionary of the Bible, ed. Katharine Doob Sakenfeld (Nashville, TN: Abingdon Press, 2006), vol. 3, p. 761-762.