For the sake of connotation, cities and other political units are generally referred to by their classical rather than contemporary names. It should be obvious from context where any particular spot lies on the map. However, the following list of geographical equivalents may be found interesting.
Ancyra: Ankara, Turkey
Aquitania: West central France
Arausio: Orange, France
Asia: In ordinary Roman usage, the modern Asia Minor plus India
Byzantium: Istanbul, Turkey
Cimberland: Himmerland, northern Jutland, Denmark
Cimmerian Bosporus: A Greek kingdom in the Crimea
Colchis: Mingrelian Georgia, U.S.S.R.
Dacia: Rumania