 Bulgaria occupies a portion of the eastern Balkan peninsula , bordering five countries — Greece and Turkey to the south , Macedonia and Serbia to the west , and Romania to the north . The land borders have a total length of 1 @,@ 808 kilometres ( 1 @,@ 123 mi ) , and the coastline has a length of 354 kilometres ( 220 mi ) . Its total area of 110 @,@ 994 square kilometres ( 42 @,@ 855 sq mi ) ranks it as the world 's 105th @-@ largest country . Bulgaria 's geographic coordinates are 43 ° N 25 ° E. 
