Claim: Farndon Bridge, a Grade I listed arch bridge located in the Farndon, Cheshire, England and Holt, Wales, crosses River Dee (113 km or 70 miles long) and was opened in 1339.
Evidence: Grade I listed Arch bridge Farndon, Cheshire, England
and Holt, Wales River Dee 1339 It has a total length of 113 km (70 miles).