The capital of Bulgaria is Sofia, a city with a population of 1.2 million people. It is the largest city in the country and is located in the western part of the country. It is the political, economic, cultural, and educational center of Bulgaria. Sofia has a long history, dating back to the 4th century BC when it was founded by the Thracians. It has been an important city throughout its history, serving as the capital of the Roman, Byzantine, Bulgarian, and Ottoman Empires. Today, Sofia is a modern city with a vibrant culture and economy.