The Sussex Wildlife Trust (SWT) is a conservation charity which aims to protect natural life in Sussex. It was founded in 1961 and is one of 46 wildlife trusts across the UK and the Isle of Man and Alderney. As of 2019, it has 33,000 members and manages 2,000 hectares of land for nature. It is a registered charity and in the year to 31 March 2019 it had an income of £5.7 million and expenditure of £4 million, resulting in net income of £1.7 million.
Weir Wood Reservoir is a 153.5-hectare (379-acre) biological Site of Special Scientific Interest west of Forest Row in East Sussex. It is in High Weald Area of Outstanding Natural Beauty and an area of 32.6 hectares is a Local Nature Reserve which is owned by Southern Water and managed by East Sussex County Council and Southern Water.
Wormley-Hoddesdonpark Wood North is a 143.9-hectare (356-acre) woodland area in Hertfordshire which has been designated as a biological site of Special Scientific Interest. The site is listed as Grade 1 in A Nature Conservation Review, and is also designated a Special Area of Conservation. It is in Hoddesdon in the borough of Broxbourne, but part of the site is in East Hertfordshire.
Bingletts Wood is a 16-hectare (40-acre) biological Site of Special Scientific Interest east of Heathfield in East Sussex.
Bream Wood is a 7.8-hectare (19-acre) biological Site of Special Scientific Interest north of Crowborough in East Sussex.
High Woods is a 33.7-hectare (83-acre) biological Site of Special Scientific Interest on the northern outskirts of Bexhill-on-Sea in East Sussex. It is owned by Rother District Council and managed by Highwoods Preservation Society.
Penn's Rocks is a 10.2-hectare (25-acre) biological Site of Special Scientific Interest north of Crowborough in East Sussex.
Fore Wood is a 20.9-hectare (52-acre) biological Site of Special Scientific Interest north-west of Hastings in East Sussex. It is part of the Royal Society for the Protection of Birds nature reserve of the same name.
Marline Valley Woods is a 55.1-hectare (136-acre) biological Site of Special Scientific Interest on the western outskirts of Hastings in East Sussex. An area of 40.3 hectares is a Local Nature Reserve owned by Hastings Borough Council and managed by the Sussex Wildlife Trust.
Darwell Wood is a 37.5-hectare (93-acre) biological Site of Special Scientific Interest north-west of Battle in East Sussex.
Denham Lock Wood is a 6.3-hectare (16-acre) biological Site of Special Scientific Interest (SSSI) next to the Grand Union Canal, and near Denham in the London Borough of Hillingdon. It was notified in 1986 and is managed by the London Wildlife Trust on behalf of Hillingdon Council. It lies within the Colne Valley Regional Park.
Brookland Wood is a 10.9-hectare (27-acre) biological Site of Special Scientific Interest east of Tunbridge Wells in Kent.
Parsonage Wood is a 9.7-hectare (24-acre) biological Site of Special Scientific Interest south-east of Cranbrook in Kent. It is owned and managed by the Kent Wildlife Trust.
Ellenden Wood is a 90.6-hectare (224-acre) biological Site of Special Scientific Interest south of Whitstable in Kent. It is a Nature Conservation Review site, Grade 2. and a Special Area of Conservation
Robins Wood is a 47.7-hectare (118-acre) biological Site of Special Scientific Interest between Tunbridge Wells and Ashford in Kent.
Buchan Hill Ponds is a 19.5-hectare (48-acre) biological Site of Special Scientific Interest on the south-west outskirts of Crawley in West Sussex.
Cow Wood and Harry's Wood is a 75.5-hectare (187-acre) biological Site of Special Scientific Interest east of Handcross in West Sussex. it is in the High Weald Area of Outstanding Natural Beauty.
Wakehurst and Chiddingly Woods is a 155.9-hectare (385-acre) biological and geological Site of Special Scientific Interest south-east of Crawley in West Sussex, England. It is a Nature Conservation Review site, Grade I, and part of it is a Geological Conservation Review site.
