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.
Mustafa Kemal Atatürk
The Balkan Pact was negotiated by Atatürk with Greece, Romania, and Yugoslavia. This mutual-defence agreement intended to guarantee the signatories' territorial integrity and political independence against attack by another Balkan state such as Bulgaria or Albania. It countered the increasingly aggressive foreign policy of fascist Italy and the effect of a potential Bulgarian alignment with Nazi Germany. Atatürk thought of the Balkan Pact as a medium of balance in the relations with the European countries. He was particularly anxious to establish a region of security and alliances in the west of Turkey and in Balkan Europe, which would extend as far as Dobruja.