A site of special scientific interest (SSSI) in Great Britain, or an area of special scientific interest (ASSI) in the Isle of Man and Northern Ireland, is a conservation designation denoting a protected area in the United Kingdom and Isle of Man. SSSI/ASSIs are the basic building block of site-based nature conservation legislation and most other legal nature/geological conservation designations in the United Kingdom are based upon them, including national nature reserves, Ramsar sites, Special Protection Areas, and Special Areas of Conservation. The acronym "SSSI" is often pronounced "triple-S I".
Swithland Wood and The Brand is a 87.9 hectares biological Site of Special Scientific Interest south of Woodhouse Eaves in Leicestershire. Swithland Wood is a Nature Conservation Review site, Grade II. The Brand is designated a Precambrian site in the Geological Conservation Review, but the dating has been changed due to the discovery of trace fossils from the succeeding Cambrian period.
Blackbrook Reservoir is a 33.4-hectare (83-acre) biological Site of Special Scientific Interest between Shepshed and Whitwick in Leicestershire.
Charnwood Lodge is a 134.2-hectare (332-acre) biological and geological Site of Special Scientific Interest in Charnwood Forest, east of Coalville in Leicestershire. It is a national nature reserve, and contains two Geological Conservation Review sites. It is managed by the Leicestershire and Rutland Wildlife Trust.
Biddenham Pit is a gravel pit and Site of Special Scientific Interest (SSSI), 0.41 hectares in size located in Biddenham, Bedfordshire. The pit was notified to Bedford Borough Council and Bedfordshire County Council under the Wildlife and Countryside Act (1981) in 1988, and is also a Geological Conservation Review site. The site is owned by Persimmon Homes and Kier Homes, with management advice given by Natural England.
Upware South Pit is a 1.1-hectare (2.7-acre) geological Site of Special Scientific Interest (SSSI) north of Upware in Cambridgeshire. It is a Geological Conservation Review site.
Shippea Hill SSSI is a 27.6-hectare (68-acre) geological Site of Special Scientific Interest east of Ely in Cambridgeshire, England. It is a Geological Conservation Review site.
Cranford St John SSSI is a 2.8-hectare (6.9-acre) geological Site of Special Scientific Interest in Cranford St John, east of Kettering in Northamptonshire. It is a Geological Conservation Review site.
Bardon Hill Quarry is a 58.2-hectare (144-acre) geological Site of Special Scientific Interest east of Coalville in Leicestershire. It is a Geological Conservation Review site.
Beacon Hill, Hangingstone and Outwoods is a 147.5-hectare (364-acre) biological and geological Site of Special Scientific Interest (SSSI) south of Loughborough in Leicestershire. It is also a Geological Conservation Review and a Nature Conservation Review site. The Outwoods and Beacon Hill are part of The National Forest. Two areas in the SSSI, Beacon Hill and Jubilee Woods are country parks managed by Leicestershire County Council, and The Outwoods is managed by Charnwood Borough Council.
Bradgate Park and Cropston Reservoir is a 399.7-hectare (988-acre) geological Site of Special Scientific Interest north–west of Leicester. It is also a Nature Conservation Review site, and Bradgate Park contains Geological Conservation Review sites and a Scheduled Monument.
Wing Water Treatment Works is a 1.5-hectare (3.7-acre) geological Site of Special Scientific Interest east of Wing in Rutland. It is a Geological Conservation Review site.
Ives Head is a 5 hectares geological Site of Special Scientific Interest south of Shepshed in Leicestershire. It is a Geological Conservation Review site.
Cliffe Hill Quarry is a 19.2 hectares geological Site of Special Scientific Interest on the western outskirts of Markfield in Leicestershire. It is a Geological Conservation Review site.
Setchey SSSI is a 33.4-hectare (83-acre) geological Site of Special Scientific Interest south of King's Lynn in Norfolk. It is a Geological Conservation Review site.
Stanford Training Area SSSI is part of the British Army Stanford Training Area. It is a 4,678-hectare (11,560-acre) biological and geological Site of Special Scientific Interest north of Thetford in Norfolk. It is a Nature Conservation Review site and part of it is a Geological Conservation Review site. It is also part of the Breckland Special Area of Conservation and Special Protection Area.
Wretton SSSI is a 20.6-hectare (51-acre) geological Site of Special Scientific Interest north-east of Downham Market in Norfolk. It is a Geological Conservation Review site.
