Which ancient Roman aqueduct bridge in southern France crosses the Gardon River?

The Pont du Gard is the ancient Roman aqueduct bridge in southern France that crosses the Gardon River.

Built in the first century AD, it formed part of an aqueduct carrying water to Nemausus, the Roman city now known as Nîmes. Its three tiers of precisely cut limestone arches allowed the water channel to maintain a very gentle gradient over the river valley.

Although often called a bridge, the Pont du Gard was primarily an aqueduct. Its lower level carried people and vehicles, while the upper level supported the water conduit. It is one of the best-preserved Roman aqueduct structures and became a UNESCO World Heritage Site in 1985.