National Cycle Route 51 is an English long distance cycle route running broadly east-west connecting Colchester and the port of Harwich to Oxford via Ipswich, Bury St Edmunds, Cambridge, Bedford, Milton Keynes, Bicester, and Kidlington.
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Forms part of the North Sea Cycle Route.
Colchester | Wivenhoe | Great Oakley | Harwich
This section runs from Colchester and National Cycle Route 1 to Harwich, where a seasonal foot ferry can be caught to Suffolk where the line continues.
For much of its length it is also the route of the North Sea Cycle Route, although this branches off at a park in Dovercourt to head to the Harwich International Port at Parkeston where there is access via ferry to the Continent.
At Harwich the signs indicate the route is 22 miles to Colchester, 3 to the International Port and 1 to Dovercourt. The North Sea Cycle Route junction is 1 mile along the route from Harwich to Colchester.
Harwich | Felixstowe | Nacton | Ipswich
The route from Harwich to Felixstowe uses the Harwich Harbour Ferry (summer only, check timetable) to Langard Point offering an impressive view of The Port of Felixstowe.