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Later designers and engineers, such as Thomas Telford, improved both the design and quality of the material in bridges (for example, at Buildwas upstream of Coalbrookdale) and aqueducts (such as the world-famous Pontcysyllte Aqueduct in North Wales).
Within ten years Telford had completed the far more ambitious Pontcysyllte Aqueduct on the Llangollen Canal over the River Dee valley—total length 307 metres.