- A country of southeast Europe on the Black Sea. Settled in the 6th centurya.d. by Slavic tribes, it was ruled by Turkey from the late 14th to the early 20th century. Sofia is the capital and the largest city. Population, 8,960,679. 保加利亚：欧洲东南部的一个国家，位于黑海岸边。于公元 6世纪由斯拉夫人建立，14世纪末至20世纪初受土耳其统治。索非亚是其首都及最大城市。人口8,960,679.