Macedonia (/ˌmæsɪˈdoʊniə/) 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: larger parts in Greece, North Macedonia, and Bulgaria, and smaller parts in Albania, Serbia, and Kosovo. It covers approximately 67,000 square kilometres (25,869 sq mi) and has a population of 4.76 million.