Water

Balkan Mountains divide Bulgaria’s Black Sea catchment and the Aegean Sea. In the catchment of the Black Sea is the longest river Danube (471 km in length limits, Bulgaria), which is the river border with Romania, together with its tributaries: Crowbar, Ogosta, Iskyr (Bulgaria is the longest river flowing entirely within its borders), Osym, Yantra River. In addition, the largest river catchment in the Aegean Sea to the Maritsa and Arda Tundżą, Kamczija, Mesta and Struma. Taken advantage of the river are mainly for irrigation and electricity production. The lakes are few and small, are the main type lagunowego occur mainly along the coast. In the Pirin and Rila mountains is approximately 260 glacial lakes of origin. At the Old Płaninie is the largest waterfall in Bulgaria and also the largest in the whole Balkans – Rajsko Praskalo.

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