The Maritsa River is one of the longest rivers in the Balkan Peninsula, flowing through Bulgaria, Greece, and Turkey. It spans approximately 480 kilometers and is known for its rich biodiversity and historical significance. The river originates in the Rila Mountains of Bulgaria and eventually empties into the Aegean Sea. The Maritsa serves as an important waterway for transportation and irrigation in the region. It also forms part of the natural border between Bulgaria and Turkey. The river's basin supports various ecosystems, making it a vital habitat for numerous plant and animal species.