Nantwich is a market town in south Cheshire, England, in the Borough and parliamentary constituency of Crewe and Nantwich. Nantwich has suffered several disasters in its history. The origins of the settlement date to Roman times when salt from Nantwich was used by the Roman garrisons at Chester and Stoke-on-Trent as both a preservative and a condiment. Geographically, Nantwich is on the 'Cheshire Plain', on the banks of the River Weaver and close to the Llangollen and Shropshire Union Canals, just south of the latter's junction with the Trent and Mersey Canal.