Bulgaria
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 , and the coastline has a length of . Its total area of ranks it as the world's 105th-largest country. Bulgaria's geographic coordinates are 43° N 25° E. The most notable topographical features are the Danubian Plain, the Balkan Mountains, the Thracian Plain, and the Rhodope Mountains. The southern edge of the Danubian Plain slopes upward into the foothills of the Balkans, while the Danube defines the border with Romania. The Thracian Plain is roughly triangular, beginning southeast of Sofia and broadening as it reaches the Black Sea coast.
Demographic history of Macedonia
The Balkan Wars (1912–1913) and World War I (1914–1918) left the region of Macedonia divided among Greece, Serbia, Bulgaria, and Albania and resulted in significant changes in its ethnic composition. 51% of the region's territory went to Greece, 38% to Serbia and 10% to Bulgaria. At least several hundred thousand, left their homes, the remaining were also subjected to assimilation as all "liberators" after the Balkan War wanted to assimilate as many inhabitants as possible and colonize with settlers form their respective nation. The Greeks become the largest population in the region. The formerly leading Muslim and Bulgarian communities were reduced either by extermination or change of identity.