no
Region in the Balkan peninsula
yes
The three countries that compose the eastern Balkan region are Bulgaria, Romania, and Moldova.
Bulgaria is similar to Romania.
The Balkans
Bulgaria has a vast area of fertile, plain land (Danube plain) and good plain in Dobruja. Here Bulgaria grows it wheat. Wheat is surplus in the country and Bulgaria exports the surplus.
Hungary, Serbia, Bulgaria, Ukraine, Moldova
Yazovir Dospat (lake Dospat), its in the Rhodopes region
Because of geography and nature, bio-diversity, difference in tradition and culture, economic difference etc etc.
Rhodope is one of the regional units of Greece.It is part of the region of East Macedonia and Thrace.The Rhodope mountains run from Southern Bulgaria into this region.
Bosnia (Bosna & Herzegovina) and Bulgaria having common identiyty of Balkan nations. No direct border. They have many common words in the talking (slavic origin words).