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Low Danube water levels in Bulgaria expose Roman-era bridge

By Thomson Reuters Aug 6, 2026 | 10:27 AM

SOFIA, Aug 6 (Reuters) – Exceptionally low water levels on the Danube have exposed parts of the foundations of the ancient Constantine ​Bridge, giving Bulgarian archaeologists a rare opportunity ‌to document what they describe as one of the Roman Empire’s most impressive engineering achievements.

A succession of record-breaking heatwaves in Europe this summer has caused a severe drought ‌in ​parts of the continent, affecting ⁠major waterways such ⁠as the Danube and the Rhine.

“For archaeologists, these moments are extremely valuable because nature briefly reveals an object that is hidden beneath the ​Danube for most of the time,” said Pavel Popov of the Regional Historical Museum in ⁠Pleven. “It gives us a rare ⁠opportunity to observe, document and study ​it in its real environment.”

The bridge, commissioned by ​Emperor Constantine I and inaugurated in A.D. 328, ‌linked the ancient city of Ulpia Oescus with Sucidava in what is now Romania. Stretching more than 2 km (1.2 miles), it is regarded as ⁠one of the longest bridges of antiquity, though short-lived. It is believed to have been largely destroyed around ⁠A.D. 367.

Last ‌Tuesday, a team from the Pleven ⁠museum carried out aerial photography and ​documentation ‌of visible bridge remains, close to ​the village ⁠of Gigen in northern Bulgaria.

Researchers used drones to map and photograph the exposed remains, tracing the line of visible foundations and assessing their condition.

(Reporting by Stoyan Nenov; Writing by Ivana Sekularac, editing by ​Andrei Khalip)