The famous 'Pont del Diable', or Devil’s Bridge, is only a fragment of a much larger conduit used to supply the city with water from the Francolí River. The water was taken from the Rourell area, 92 metres above sea level, and carried more than ten kilometres through a network of conduits and aqueducts of varying sizes. The portion constituting what is today called the Les Ferreres aqueduct is 217 metres long and nearly 2 metres wide, reaching a maximum height of 27 metres. The upper tier is comprised of 25 arches, and the lower tier of 11, each with a span of 5.90 metres. The structure was built in the 1st century A.D. from large ashlars stacked without mortar to form the two tiers of arches.