Pelagonia is a geographical region of Macedonia named after the ancient kingdom. Ancient Pelagonia roughly corresponded to the present-day municipalities of Bitola, Prilep, Mogila, Novaci, Kruševo, and Krivogaštani in North Macedonia and to the municipalities of Florina, Amyntaio and Prespes in Greece.

Macedonia is a geographical and historical region of the Balkan Peninsula in Southeast Europe. Its boundaries have changed considerably over time; however, it came to be defined as the modern geographical region by the mid-19th century. Today the region is considered to include parts of six Balkan countries: all of North Macedonia, large parts of Greece and Bulgaria, and smaller parts of Albania, Serbia, and Kosovo. It covers approximately 67,000 square kilometres (25,869 sq mi) and has a population of around five million. Greek Macedonia comprises about half of Macedonia's area and population.