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".
Weston-in-Gordano SSSI is a 12.55 hectare geological Site of Special Scientific Interest near the village of Weston in Gordano, North Somerset, notified in 1993.
Tickenham, Nailsea and Kenn Moors SSSI is a 129.4 hectare biological Site of Special Scientific Interest between Tickenham, Nailsea and Kenn on the North Somerset Levels, notified in 1995.
The Cheddar Complex is a 441.3 hectare biological Site of Special Scientific Interest near Cheddar around the Cheddar Gorge and north east to Charterhouse in the Mendip Hills, Somerset, notified in 1952.
Great Quarry, Swindon is a 0.994 hectare geological Site of Special Scientific Interest (SSSI) in Wiltshire, England, notified in 1951.
Blue Anchor to Lilstock Coast SSSI is a 742.8 hectare geological Site of Special Scientific Interest between Blue Anchor and Lilstock in Somerset, notified in 1971.
Glenthorne is a 13.3 hectare geological Site of Special Scientific Interest in the parish of Oare within the Exmoor National Park, on the border of Somerset and Devon, notified in 1989.
Leighton Road Cutting is a 0.6 hectare geological Site of Special Scientific Interest between East Cranmore and Cloford in Somerset, notified in 1984. It is a Geological Conservation Review site
Low Ham is a village in the civil parish of High Ham in the English county of Somerset.
Raisby Hill Quarry is a Site of Special Scientific Interest in east County Durham, England. It lies just under 2 km east of the village of Coxhoe.
Land Grove Quarry, Mitcheldean is a 3.8-hectare (9.4-acre) geological Site of Special Scientific Interest in Gloucestershire, notified in 1974. The site is listed in the 'Forest of Dean Local Plan Review' as a Key Wildlife Site (KWS).
Lydney Cliff is a 8.0-hectare (20-acre) geological Site of Special Scientific Interest in Gloucestershire, notified in 1990. Part of the site is included in the Severn Estuary SSSI.
