Hart Warren Dunes
Hart Warren Dunes is a designated Site of Special Scientific Interest (SSSI) and one of the most unique dune systems in the UK. It sits on permian magnesian limestone, making it the only significant calcareous dune system in the British Isles.
The site supports a wide range of wildlife and is home to species-rich calcareous dune grassland, particularly in the northern and central areas of the adjacent golf course.
Rare plants and butterflies
The central section of the site contains damp hollows that support regionally rare orchids, including:
- burnt tip orchid
- pyramidal orchid
Nineteen species of butterfly have been recorded here, including:
- dingy skipper
- northern brown argus (known locally as the Durham brown argus)
The northern brown argus thrives in dry, unimproved grassland where common rock rose, its larval foodplant, grows.
Little tern nesting site
At the northern edge of the site near Crimdon, a colony of little terns nests each year. These rare seabirds arrive in April and nest in shallow scrapes just above the high tide line.
The nesting area is fenced annually and protected by INCA and partner organisations. Wardens monitor the site and raise awareness through reports and media coverage. The birds begin their return journey to West Africa in late August.
Historic features
The site also contains Second World War defences, including pillboxes, anti-tank obstacles and a battery and bombing decoy.
These features add to the site's historical and educational value.
Access information
Hart Warren Dunes is located south of Crimdon Beck. Due to the sensitive nature of the site, access is limited. You can reach the dunes by:
- walking along the beach from Crimdon (north) or the Headland (south)
- using the public right of way via the footbridge on the Hart to Haswell Walkway