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.
Kennet and Lambourn Floodplain is a 23.4-hectare (58-acre) biological Site of Special Scientific Interest in six widely separated areas in the floodplains of the River Lambourn in Berkshire and the River Kennet in Wiltshire, England. It is a Nature Conservation Review site and part of the Kennet and Lambourn Floodplain Special Area of Conservation. One of the areas, Rack Marsh, is managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust.
Hatch Park is a 71.8-hectare (177-acre) biological Site of Special Scientific Interest east of Ashford in Kent. It is listed by Historic England on the Register of Historic Parks and Gardens of Special Historic Interest in England.
Burham Marsh nature reserve is an 11 hectare tidal Reed bed on the River Medway 5 miles northwest of Maidstone. It is just east of Snodland but being on the east bank of the river it is accessed via Burham. It is part the Holborough to Wouldham Marshes Site of Special Scientific Interest.
Ingrebourne Marshes are a 74.8 hectare biological Site of Special Scientific Interest in Hornchurch in the London Borough of Havering. Ingrebourne Valley Local Nature Reserve includes a small part of the SSSI west of the River Ingrebourne. The site is managed by the Essex Wildlife Trust
Moor Park is a 6.7-hectare (17-acre) biological Site of Special Scientific Interest east of Farnham in Surrey.
Lye Valley is a 2.3-hectare (5.7-acre) biological Site of Special Scientific Interest in Headington, a suburb of Oxford in Oxfordshire. It is part of the 4.5-hectare (11-acre) Lye Valley Local Nature Reserve, which is owned and managed by Oxford City Council.
Little Hallingbury Marsh is a 4.5-hectare (11-acre) biological Site of Special Scientific Interest adjacent to the River Stort, west of Little Hallingbury in Essex. It was notified under Section 28 of the Wildlife and Countryside Act 1981, and the local planning authority is Uttlesford District Council.
West Thurrock Lagoon and Marshes is a 66.1-hectare (163-acre) biological Site of Special Scientific Interest in West Thurrock in Essex.
Howlands Marsh is a 29.9-hectare (74-acre) nature reserve north-east of St Osyth in Essex. It is managed by the Essex Wildlife Trust. It is part of the Colne Estuary Site of Special Scientific Interest Special Protection Area and Ramsar site, and the Blackwater Flats and Marshes Nature Conservation Review site.
Holborough to Burham Marshes is a 149.8-hectare (370-acre) biological Site of Special Scientific Interest Kent. Holborough Marshes and Burham Marsh are managed by the Kent Wildlife Trust.
Medway Estuary and Marshes is a 4,748.8-hectare (11,735-acre) biological Site of Special Scientific Interest which stretches along the banks of the River Medway between Gillingham and Sheerness in Kent. It is a Nature Conservation Review site, Grade I, a Ramsar internationally important wetland site, and a Special Protection Area under the European Union Directive on the Conservation of Wild Birds.
Sandwich Bay to Hacklinge Marshes is a 1,790.1-hectare (4,423-acre) biological and geological Site of Special Scientific Interest which stretches between Deal and Sandwich in Kent. It includes two Geological Conservation Review sites, and most of it is a Nature Conservation Review site, Grade I. Part of it is a Ramsar site, a Special Area of Conservation, a Special Protection Area and a National Nature Reserve, It also includes a Kent Wildlife Trust nature reserve and a Local Nature Reserve,
South Thames Estuary and Marshes is a 5,289-hectare (13,070-acre) biological Site of Special Scientific Interest which stretches between Gravesend and the mouth of the River Medway in Kent. Part of it is a Nature Conservation Review site, Grade I, and part is a Royal Society for the Protection of Birds nature reserve. It is part of the Thames Estuary and Marshes Ramsar internationally important wetland site and Special Protection Area under the European Union Directive on the Conservation of Wild Birds.
Holborough Marshes is a 35-hectare (86-acre) nature reserve on the outskirts of Snodland, south-west of Chatham in Kent. It is managed by Kent Wildlife Trust. It is part of Holborough to Burham Marshes Site of Special Scientific Interest.
Papercourt Marshes is a 10-hectare (25-acre) nature reserve in the south-east of the borough of Woking in Surrey. It is managed by the Surrey Wildlife Trust. A roughly 50 hectares lake and associated surrounds, including the marshes totalling 20.0 hectares is designated a biological Site of Special Scientific Interest as Papercourt.
Filsham Reedbed is an 18.5-hectare (46-acre) Local Nature Reserve on the western outskirts of St Leonards-on-Sea in East Sussex. It is owned by Hastings Borough Council and managed by Sussex Wildlife Trust. It is part of Combe Haven Site of Special Scientific Interest.
East Aston Common is an 18.2-hectare (45-acre) biological Site of Special Scientific Interest east of Andover in Hampshire.
