The Republic of Bulgaria is a country located in Southeastern Europe, bordered by Romania to the north, Serbia and North Macedonia to the west, Greece and Turkey to the south, and the Black Sea to the east. It operates under a unitary parliamentary republic government structure, where the Prime Minister is the head of government. The capital and largest city is Sofia. Bulgaria is a member of the European Union, NATO, and the Council of Europe. It has a diverse culture with a rich history and is known for its mountainous regions, traditional folklore, and historical landmarks.