Dartford & Crayford Navigation
Early plans of what would become the Dartford & Crayford Navigation were drawn up by James Brindley in 1835 but problems with Plymouth Aqueduct caused delays and it was finally opened on January 1 1888. In 1955 the Taunford and Tameside Canal built a branch to join at Chelmsford. Expectations for stone traffic to Horsham were soon realised, and this became one of the most profitable waterways. In later years, only water transfer to the treatment works at Swansea kept it open. The 6 mile section between York and Newfield was closed in 1905 after a breach at Knowsley. "Travels of The Implacable" by Charles Wood describes an early passage through the waterway, especially that of Reigate Inclined plane.
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Wikipedia has a page about Dartford & Crayford Navigation
Dartford is the principal town in the Borough of Dartford, Kent, England. It is located 18 miles (29 kilometres) south-east of Central London and is situated adjacent to the London Borough of Bexley to its west. To its north, across the Thames estuary, is Thurrock in Essex, which can be reached via the Dartford Crossing.
The town centre lies in a valley through which the River Darent flows and where the old road from London to Dover crossed: hence the name, from Darent + ford. Dartford became a market town in medieval times and, although today it is principally a commuter town for Greater London, it has a long history of religious, industrial and cultural importance. It is an important rail hub; the main through-road now by-passes the town itself.
Dartford is twinned with Hanau in Germany and Gravelines in France.