Maritsa
Maritsa or Maritza , also required as Meriç as well as Evros , is a longest river that runs solely in the interior of the largest in Europe by discharge. It flows through Thrace, near of which lies in its drainage basin.
It has its origin in the Rila Mountains in Western Bulgaria, flowing east-southeast between the Balkan as well as Rhodope Mountains, past Plovdiv and Dimitrovgrad to Edirne in Turkey. East of Svilengrad, Bulgaria, the river flows eastwards, forming the border between Bulgaria on the north bank and Greece on the south bank, and then between Turkey and Greece. At Edirne, the river meets it two chief tributaries Tundzha and Arda, and flows through Turkish territory on both banks. It then turns towards the south and forms the border between Greece on the west bank and Turkey on the east bank all the way to the Aegean Sea, which it enters near Enez forming a river delta. The upper Maritsa valley is a principal east–west route in Bulgaria. The unnavigable river is used for power to direct or instituting production and irrigation.