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Saltfleetby - Theddlethorpe Dunes

This important reserve contains tidal sand and mudflats, salt and freshwater marshes and sand dunes.

The larger part, 556 hectares, is a statutory National Nature Reserve managed by Natural England. Approximately 38 hectares (95 acres) are managed by the Trust on a licence agreement with the Ministry of Defence. Another 4 hectares (9.8 acres) are leased from Lincolnshire County Council, and the Trust owns about 3 hectares (7.5 acres) comprising the Sea View Field and Rimac Bridge. The total area within the SSSI is 951 hectares. The whole area is managed in close cooperation between the Trust and Natural England.

This important reserve contains tidal sand and mudflats, salt and freshwater marshes and sand dunes. On the foreshore, accreting mud and silt flats and saltmarsh in the north give way to a narrower sandy beach at the southern end. The sand dunes are also much wider in the north and there is an extensive freshwater marsh between two dune ridges, which converge into a narrower ridge south of Churchill Lane at Theddlethorpe. The much older landward dunes developed on a storm beach formed in the 13th century. The second ridge on the northern half of the reserve, enclosing the freshwater marsh, developed in the mid-1800s following the diversion of the Great Eau. New dunes are now forming along the southern half of the reserve.


Nearest postcode: LN11 7TS

Please note - postcodes are for the nearest registered address as we are unable to get postcodes for nature reserves. Please use the maps provided here to locate the entrance to the reserve.


Click on the image below to open 3D interactive panorama of Saltfleetby-Theddlethorpe Dunes



Species and habitats

Coastal, Grassland

Nearby nature reserves

Toby's Hill
2 miles - Lincolnshire Wildlife Trust
Donna Nook NNR
6 miles - Lincolnshire Wildlife Trust
Legbourne Wood
8 miles - Lincolnshire Wildlife Trust

Nature reserve map

Reserve information

Map reference
TF 467917
Best time to visit
Jan - Dec
Get directions
Find out here
Public transport
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Opening Times
Open at all times
951.00 hectares
National Nature Reserve (NNR)

Various routes around the reserve including an easy access trail at Rimac.
Walking information
Although most of the reserve is open to the public, visitors are requested to keep out of the signed sanctuary areas.
Parking at several entrances.
No dogs allowed
Grazing animals
Reserve manager
Lincolnshire Wildlife Trust
Tel: 01507 526667


Factsheets and guides for your visit