What are the Major Rivers of Bulgaria?

* Danube River: The Danube River forms a major part of Bulgaria's northern and northwestern border. It is one of the longest rivers in Europe and has been an important trade route for centuries.

* Iskar River: The Iskar River is the longest entirely within Bulgaria. It flows through western Bulgaria and passes through the capital city, Sofia. The Iskar River is used for hydroelectric power generation and irrigation.

* Maritsa River: The Maritsa River is the second-longest river in Bulgaria. It flows through southern Bulgaria and empties into the Aegean Sea. The Maritsa River Valley is a major agricultural region in Bulgaria.

* Ogosta River: The Ogosta River is a tributary of the Danube River and flows through northwestern Bulgaria. The Ogosta River is known for its picturesque gorges and canyons.

* Yantra River: The Yantra River is another tributary of the Danube River and flows through northeastern Bulgaria. The Yantra River is known for its white-water rafting opportunities.