The Maritsa River is one of the longest rivers in the Balkan Peninsula, flowing approximately 480 kilometers. It originates in the Rila Mountains of Bulgaria and travels through Greece and Turkey before emptying into the Aegean Sea. The river is significant for its role in irrigation and as a water source for the surrounding regions. The Maritsa River basin supports diverse ecosystems and is home to various species of fish and birds. It also serves as a natural border between Bulgaria and Turkey for part of its course. The river has historical importance, having been a vital trade route for centuries.