What is the largest country of Balkan Peninsula?

The largest country in the Balkan peninsula is Bulgaria. It is located in Southeastern Europe and borders Greece to the south, Serbia and North Macedonia to the west, Romania to the north, and Turkey to the southeast. Bulgaria has a total area of 110,994 square kilometres (42,855 sq mi) and a population of over 6.9 million people. Sofia, the capital and largest city of Bulgaria, is situated in the western part of the country and has a population of over 1.2 million people. Bulgaria is a member of the European Union, NATO, and the United Nations.