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This route will connect Tower Bridge in London with Fakenham in Norwich. Passing through East London close to the Thames, Route 13 then heads north from Tilbury to Chelmsford in Essex. After a stretch on National Route 1 (also part of EuroVelo 2) National Route 13 resumes at Colchester and continues north to rejoin National Route 1 just south of Fakenham in Norfolk.
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Rainham Marshes is an RSPB nature reserve to the east of London, adjacent to the Thames Estuary in Purfleet.
In 2000, the area of land was bought from the Ministry of Defence, who used it as a test firing range. With no activity for several years, the nature reserve was officially opened to the public in 2006. It has maintained much of its Medieval landscape, and is the largest area of wetland on the upper parts of the Thames Estuary.
The reserve contains Wennington, Aveley and Rainham Marshes, which have been designated as a Metropolitan Site of Importance for Nature Conservation. It has also been designated by Natural England as a Site of Special Scientific Interest as the Inner Thames Marshes.
The reserve is home to a diverse range of bird species, wetland plants and insects. It also has one of the most dense water vole populations in the country. In December 2005, the site was visited by a Sociable Lapwing; over 1,700 people visited the reserve to see this bird. Late in the bird's stay, four Penduline Tits were also found at the site. Entrance to the site is free to residents of Thurrock and the London Borough of Havering.