Bulgaria

Bulgaria, officially the Republic of Bulgaria, is a country in Southeastern Europe. It is situated on the eastern portion of the Balkans directly south of the Danube river and west of the Black Sea. Bulgaria is bordered by Greece and Turkey to the south, Serbia and North Macedonia to the west, and Romania across the Danube river to the north. It covers a territory of 110,994 square kilometres, making it the tenth largest within the European Union and the sixteenth-largest country in Europe by area. Sofia is the nation's capital and largest city; other major cities include Plovdiv, Varna, and Burgas. One of the earliest societies in the lands of modern-day Bulgaria was the Karanovo culture. In the 6th to 3rd century BC, the region was a battleground for ancient Thracians, Persians, Celts, and Macedonians; stability came when the Roman Empire conquered the region in AD 45. After the Roman state splintered, tribal invasions in the region resumed.

Data Source : Wikipedia