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.
Balkan Pact
The Balkan Pact helped to ensure peace between the signatory nations, but failed to stem regional intrigue. The countries of the pact surrounded Bulgaria, but on 31 July 1938 they signed an agreement with her in Salonika, repealing those clauses of the Treaty of Neuilly-sur-Seine and Treaty of Lausanne that mandated demilitarised zones on the Greco-Bulgarian and -Turkish borders, and allowing Bulgaria to re-arm herself.