The Troad or Troas is a historical region in northwestern Anatolia. It corresponds with the Biga Peninsula in the Çanakkale province of modern Turkey. Bounded by the Dardanelles to the northwest, by the Aegean Sea to the west and separated from the rest of Anatolia by the massif that forms Mount Ida, the Troad is drained by two main rivers, the Scamander (Karamenderes) and the Simois, which join at the area containing the ruins of Troy.

Mysia was a region in the northwest of ancient Asia Minor. It was located on the south coast of the Sea of Marmara. It was bounded by Bithynia on the east, Phrygia on the southeast, Lydia on the south, Aeolis on the southwest, Troad on the west, and the Propontis on the north. In ancient times it was inhabited by the Mysians, Phrygians, Aeolian Greeks and other groups.