Uzunköprü is a town in Edirne Province in Turkey. It is named after a historical stone bridge, claimed to be the world's longest, on the Ergene River. It is a strategically important border town, located on the routes connecting Turkey to the Balkans and Europe. It is the seat of Uzunköprü District. Its population is 39,577 (2022). Uzunköprü is the third most populous town of Edirne Province.
The town is served by Uzunköprü railway station.
Didymoteicho (Greek: Διδυμότειχο, romanized: Didymóteicho IPA: [ðiðiˈmotixo]) is a town located on the eastern edge of the Evros regional unit of Eastern Macedonia and Thrace, in northeastern Greece. It is the seat of the municipality of the same name. The town (pop. 8,681 in 2021) sits on a plain and located south east of Svilengrad, south of Edirne, Turkey and Orestiada, west of Uzunköprü, Turkey, about 20 km north of Soufli and about 90 km north of Alexandroupoli. The municipality of Didymóteicho has a land area of 565.4 km and a population of 16,060 inhabitants.