What Roman aqueduct bridge in southern France has three tiers of arches?

The Roman aqueduct bridge in southern France with three tiers of arches is the Pont du Gard.

Built in the first century AD, the Pont du Gard carried water across the Gardon River near Nîmes. Its three stacked levels rise about 49 metres above the river, with the water channel running along the top tier. The bridge formed part of an aqueduct roughly 50 kilometres long.

The tiers contain different numbers of arches: six on the lowest level, 11 in the middle, and originally 47 on the upper level. The lower deck later served as a road crossing, while the aqueduct channel was carefully engineered to maintain a very gradual downhill gradient.

A common mix-up is confusing the Pont du Gard with the aqueducts named Aqua Appia, Aqua Marcia, and Aqua Claudia. Those were Roman water-supply lines, chiefly associated with Rome; the Pont du Gard is the monumental bridge structure in France.