Southeast Europe
This concept is based on the boundaries of the Balkan peninsula. The countries that have been described as being entirely within the region are: Albania, Kosovo, Bosnia and Herzegovina, Bulgaria, Macedonia and Montenegro.
Southern Bulgaria
Southern Bulgaria (, "Yuzhna Balgariya") is the southern half of the territory of Bulgaria, located to the south of the main ridge of the Balkan Mountains which conventionally separates the country into a northern and a southern part. Besides the Balkan Mountains, Southern Bulgaria borders Serbia to the west, the Republic of Macedonia to the southwest, Greece to the south, Turkey to the southeast and the Bulgarian Black Sea Coast to the east.