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 Mountains
There are a number of waterfalls, especially in the western and central parts of the range, such as Raysko Praskalo which is the highest waterfall in the Balkan Peninsula, Borov Kamak, Babsko Praskalo, Etropole Waterfall, Karlovsko Praskalo, Skaklya and others. Developments in the recent two decades completely changed the geography of Serbia, when it comes to waterfalls. Area of the Stara Planina has always been sparsely populated and inaccessible because of the rugged and forested terrain, but also as a location of the Serbian-Bulgarian border. As armies relinquished the borders keeping to the police, civilians were allowed to explore the area. As a result, higher and higher waterfalls have been discovered on the Serbian side of the Stara Planina since then: Čungulj in 1996 - ; Pilj in 2002 - ; Kopren in 2011 - ; Kaluđerski Skokovi in 2012 - .