The Roman aqueduct in France that crosses the Gardon River and is a UNESCO World Heritage site is the Pont du Gard.
Built in southern France to carry water to the Roman colony of Nemausus, modern Nîmes, the Pont du Gard is the most spectacular surviving section of the ancient Nîmes aqueduct. Its three tiers of limestone arches span the Gardon near Vers-Pont-du-Gard and rise about 48.8 meters above the river.
The aqueduct supplied roughly 40,000 cubic meters of water per day to fountains, baths, and homes. Its channel followed an extremely gentle gradient—about 1 centimeter for every 182.4 meters—so Roman engineers had to maintain careful control of the route across more than 50 kilometers. Although tradition linked the project to Agrippa around 19 BC, later archaeological evidence generally places construction in the middle of the first century AD.
After the water system fell out of use, the bridge survived partly because it was adapted as a toll crossing. The Pont du Gard entered the UNESCO World Heritage list in 1985. It is often mistaken for an ordinary bridge, but its uppermost level carried the aqueduct channel.