You are very welcome. 
 Of course, Bulgaria's capital and biggest city is Sofia. Bulgaria is a country in southeastern Europe. 
 Any other interesting facts? 
 It appears that i do not have the information you are requesting. I can let you know at 110994 Km2 Bulgaria is Europe's 16th largest country. 
 What countries borders Bulgaria?
Of course, Bulgaria's capital and biggest city is Sofia. Bulgaria is a country in southeastern Europe.