The Arda River is a river located in southeastern Bulgaria and northeastern Greece. It is approximately 115 kilometers long and flows through the Rhodope Mountains, eventually joining the Evros River. The river is known for its scenic landscapes and rich biodiversity. The Arda River serves as an important water source for the surrounding regions. It supports various ecosystems and provides recreational opportunities such as fishing and hiking. The river's basin is also home to several small towns and villages, contributing to the local economy and culture.