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.
Calbia
Calbia is a small Balkan nation in southeastern Europe. It lies on the Adriatic Sea and is bordered by Greece, Albania, Macedonia, Serbia, and Montenegro. There are farmlands in the valleys and some flatlands. Otherwise it is heavily forested, usually with firs, and mountainous. The nation is largely undeveloped, though not a poor nation. One section of Calbia is rich in petroleum fields and dotted with oil wells. Asphalt roads, air fields, and development derived from this petroleum money were spreading throughout the nation in the 1930s.