The
Arda (, , ,
Árdas) is a long river in
Bulgaria and
Greece. It is a tributary of the
Maritsa (,
Evros). Its source lies in the Bulgarian
Rhodope Mountains near the village
Arda, part of the municipality of
Smolyan. It flows eastward past
Rudozem,
Kardzhali and
Ivaylovgrad and enters Greece in the northern part of the
Evros regional unit. It flows into the Maritsa on the border of Greece and
Turkey, between the Greek village
Kastanies and the Turkish city
Edirne. In the Bulgarian section there are three
hydroelectric and
irrigation dams,
Kardzhali Dam,
Studen Kladenets and
Ivaylovgrad Dam. The Bulgarian section is long, making the Arda the longest river in the
Rhodopes. The medieval
Dyavolski most arch bridge crosses the river from
Ardino.