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Maritsa(märē`tsä), river, c.300 mi (480 km) long, rising in the Rila Mts., W Bulgaria, and flowing SE between the Balkans and Rhodope Mts., past Plovdiv, to Edirne, Turkey, where it turns south to enter the Aegean Sea near Enez. The Tundzha is its chief tributary. The Maritsa's lower course forms part of the Bulgarian-Greek border and the Greek-Turkish line. The upper Maritsa valley is a principal east-west route in Bulgaria. The unnavigable river is used for power production and irrigation. It is known as the Évros by the Greeks and the Meriç by the Turks.
a river in the Balkan Peninsula, mostly in Bulgaria but its lower course is the boundary between Greece and Turkey. Length, 525 km; basin area, about 55,000 sq km. It begins in the Rila Mountains, flows across the Thracian lowlands, breaks through spurs of the eastern Rhodope Mountains, and flows into the Aegean Sea, forming a swampy delta. The river is primarily rain-fed and becomes very shallow in the summer. It is used for irrigation and hydroelectric power. The river is navigable from Edirne to the sea. Cities on the Maritsa are Pazardzhik, Plovdiv, and Dimitrovgrad (Bulgaria) and Edirne (Turkey).