The area included Troy, and other important cities in Asia Minor. It extended to the Hellespont (Dardanelles) to the northwest, to the Propontis (Sea of Marmara) to the north, and to the west and south, the Aegean Sea. To the east, was a mountainous region.
"Troas" Oxford Dictionary of the Classical World. Ed. John Roberts. Oxford University Press, 2007.
"Cities in and around the Troad," by J. M. Cook; The Annual of the British School at Athens Vol. 83, (1988), pp. 7-1.