The Pont des Trous (Bridge of Holes) in Tournai is one of the most remarkable vestiges of medieval military architecture in Belgium. The bridge was built in the late 13th century. It was part of the second surrounding wall of the city, which featured a total of 18 gates, and protected the course of the river Scheldt through the city. Huge portcullis could be lowered at any time. The name comes from the presence of a lock located nearby and was called Les Trous (Holes) by the inhabitants of Tournai Originally it was named Pont des Arcs.

Its construction took almost fifty years: the tower on the left bank dates from 1281 and the tower of the right bank was completed in 1304. The construction of the arches took another 25 years. In 1948 the water gate was raised by 2.40 meters in order to facilitate the passage of boats on the river.