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.
Seale Chalk Pit is a 1.2-hectare (3.0-acre) geological Site of Special Scientific Interest west of Guildford in Surrey. It is a Geological Conservation Review site and part of the Seale Chalk Pit and Meadow 3-hectare (7.4-acre) private nature reserve, which is managed by the Surrey Wildlife Trust.
Bream Wood is a 7.8-hectare (19-acre) biological Site of Special Scientific Interest north of Crowborough in East Sussex.
Southerham Grey Pit is a 8.5-hectare (21-acre) geological Site of Special Scientific Interest south-east of Lewes in East Sussex. It is a Geological Conservation Review site.
Hastingford Cutting is a 0.04-hectare (0.099-acre) geological Site of Special Scientific Interest south of Crowborough in East Sussex. It is a Geological Conservation Review site.
Stockland Farm Meadows is a 5.8-hectare (14-acre) biological Site of Special Scientific Interest south of Crowborough in East Sussex.
Eridge Green is a 8.4-hectare (21-acre) biological Site of Special Scientific Interest north-east of Crowborough in East Sussex. It is part of the 44 hectares Eridge Rocks nature reserve, which is managed by Sussex Wildlife Trust.
Stone Farm Rocks or Stone Hill Rocks is a 0.6-hectare (1.5-acre) geological Site of Special Scientific Interest south of East Grinstead in West Sussex. It is a Geological Conservation Review site.
Woolbeding and Pound Commons is a 171.9-hectare (425-acre) biological Site of Special Scientific Interest north of Midhurst in West Sussex.
Portsdown is a 69.1-hectare (171-acre) biological Site of Special Scientific Interest on Portsdown Hill, on the northern outskirts of Portsmouth in Hampshire.
Winterbourne Chalk Pit is a 0.05-hectare (0.12-acre) geological Site of Special Scientific Interest west of Winterbourne in Berkshire. It is a Geological Conservation Review site. It is located within the North Wessex Downs.
Dryhill is an 11.7-hectare (29-acre) geological Site of Special Scientific Interest on the western outskirts of Sevenoaks in Kent. It is a Geological Conservation Review site, and an area of 9.5 hectares is a Local Nature Reserve
Pembury Cutting and Pit is a 1.6-hectare (4.0-acre) geological Site of Special Scientific Interest east of Tunbridge Wells in Kent. It is a Geological Conservation Review site.
Tower Hill to Cockham Wood is a 47.8-hectare (118-acre) biological and geological Site of Special Scientific Interest on the northern outskirts of Rochester in Kent. It contains two Geological Conservation Review sites.
Warnham SSSI is a 28.5-hectare (70-acre) geological Site of Special Scientific Interest north of Horsham in West Sussex. It is a Geological Conservation Review site.
Freshfield Lane is a 17-hectare (42-acre) geological Site of Special Scientific Interest east of Haywards Heath in West Sussex. It is a Geological Conservation Review site.
Mills Rocks is a 1.9-hectare (4.7-acre) biological Site of Special Scientific Interest south-east of East Grinstead in West Sussex.
Upper Greensand Hangers: Empshott to Hawkley is a 37.7-hectare (93-acre) biological Site of Special Scientific Interest north of Petersfield in Hampshire. It is part of the East Hampshire Hangers Special Area of Conservation.
Upper Greensand Hangers: Wyck to Wheatley is a 13.2-hectare (33-acre) biological Site of Special Scientific Interest east of Alton in Hampshire. It is part of the East Hampshire Hangers Special Area of Conservation.
