Balkan MountainsThe Balkan mountain range is located in the eastern part of the Balkan Peninsula in Southeastern Europe. It is conventionally taken to begin at the peak of Vrashka Chuka on the border between Bulgaria and Serbia.
MezdraMezdra (Bulgarian: Мездра) is a town in northwestern Bulgaria, part of Vratsa Province. It is located on the left bank of the Iskar River, just north of its gorge through the Balkan Mountains.
SofiaSofia is the capital and largest city of Bulgaria. It is situated in the Sofia Valley at the foot of the Vitosha mountain, in the western part of the country. The city is built west of the Iskar river and has many mineral springs, such as the Sofia Central Mineral Baths. It has a humid continental climate. Known as Serdica in antiquity, Sofia has been an area of human habitation since at least 7000 BC.
BulgariaBulgaria, officially the Republic of Bulgaria, is a country in Southeastern Europe. It is situated on the eastern portion of the Balkans directly south of the Danube river and west of the Black Sea. Bulgaria is bordered by Greece and Turkey to the south, Serbia and North Macedonia to the west, and Romania across the Danube river to the north.
Iskar (river)The Iskar (Bulgarian: Искър, pronounced; Latin: Oescus) is a right tributary of the Danube. With a length of 368 km, it is the longest river that runs entirely within Bulgaria. Originating as three forks in the Balkans' highest mountain range Rila, the Iskar flows in a northern direction until its confluence with the Danube.
LimestoneType of sedimentary rockLimestone is a type of carbonatesedimentary rock which is the main source of the material lime. It is composed mostly of the mineralscalcite and aragonite, which are different crystal forms of calcium carbonateCaCO3. Limestone forms when these minerals precipitate out of water containing dissolved calcium.
SandstoneSandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains, cemented together by another mineral. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar because they are the most resistant minerals to the weathering processes at the Earth's surface.*As an Amazon Associate I earn from qualifying purchases.