Arda
River in Greece
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The Arda is a 290-kilometre-long river in Bulgaria and Greece. It is a tributary of the Maritsa. Its source lies in the Bulgarian Rhodope Mountains near the village Arda, part of the municipality of Smolyan. Wikipedia
Mouths: Maritsa and Douro River
Source: Smolyan
Length: 180 mi
Basin size: 5,795 km2 (2,237 sq mi); 5,213 km2 (2,013 sq mi) in Bulgaria