|Site of Special Scientific Interest|
|Grid reference||TL 206 889 |
|Area||269.4 hectares |
|Location map||Magic Map|
Holme Fen is a 269.4-hectare (666-acre) biological Site of Special Scientific Interest near Holme in Cambridgeshire.   It is also a National Nature Reserve  and a Nature Conservation Review site, Grade I.  It is part of the Great Fen project, which aims to create a 3,700 wetland wildlife area including Holme Fen, Woodwalton Fen and other areas.  It is home to a variety of birds, including the Eurasian siskin, Nightingale and Lesser redpoll, and around 450 species of fungi. 
Home Fen is described by Natural England as the finest example of birch woodland in lowland Britain. Part of it was a mere which was drained in the nineteenth century, and some relict wetland plants survive such as saw sedge and fen wood-rush.  Two new lakes have been excavated. 
Holme Fen, specifically Holme Posts, is believed to be the lowest land point in Great Britain at 2.75 metres (9.0 ft) below sea level.  
In October 2015, archaeological work to recover a WW2 Spitfire, flown by Pilot Officer Harold Penketh, that crashed into Holme Fen on 22 November 1940, was undertaken. Led by Oxford Archaeology East's project director Stephen Macauley, the teams located and recovered artefacts from the crash. A film of the excavation was shown at the Great Fen's Countryside Centre, Ramsey Heights on 27 September, 2019. 
The reserve is open to the public throughout the year. Several footpaths cross the site.
Holme Fen is at the south-western edge of the former Whittlesey Mere, which has been drained. The Great Fen Project aims to reconnect Holme Fen with nearby Woodwalton Fen, another vestigial fragment of wild fenland. Holme approximately marks the south-western limit of Stage 2 of the Great Fen Project.
Ouse Washes is a linear 2,513.6-hectare (6,211-acre) biological Site of Special Scientific Interest stretching from near St Ives in Cambridgeshire to Downham Market in Norfolk. It is also a Ramsar internationally important wetland site, a Special Protection Area for birds, a Special Area of Conservation and a Nature Conservation Review site, Grade I. An area of 186 hectares between March and Ely is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire and another area near Chatteris is managed by the Royal Society for the Protection of Birds. The Wildfowl & Wetlands Trust manages another area near Welney.
Suffolk Wildlife Trust (SWT) describes itself as the county's "nature charity – the only organisation dedicated wholly to safeguarding Suffolk's wildlife and countryside." It is a registered charity, and its headquarters is at Brooke House in Ashbocking, near Ipswich. It was founded in 1961, and is one of 46 wildlife trusts covering the Great Britain and Northern Ireland. As of March 2017, it has 13,200 members, and it manages 3,120 hectares of land in 60 nature reserves, most of which are open to the public. It had an income of £3.9 million in the year to 31 March 2017.
The Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire (WTBCN) is a registered charity which manages 126 nature reserves covering 3,945 hectares. It has over 35,000 members, and 95% of people in Bedfordshire, Cambridgeshire and Northamptonshire live within five miles of a reserve. In the year to 31 March 2016 it employed 105 people and had an income of £5.1 million. It aims to conserve wildlife, inspire people to take action for wildlife, offer advice and share knowledge. The WTBCN is one of 36 wildlife trusts covering England, and 46 covering the whole of the United Kingdom.
Wicken Fen is a 254.5-hectare (629-acre) biological Site of Special Scientific Interest west of Wicken in Cambridgeshire. It is also a National Nature Reserve, and a Nature Conservation Review site. It is protected by international designations as a Ramsar wetland site of international importance, and part of the Fenland Special Area of Conservation under the Habitats Directive.
The Great Fen is a habitat restoration project being undertaken on The Fens in the county of Cambridgeshire in England. It is one of the largest restoration projects in the country, and aims to create a 3,700 hectare wetland and aims to connect Woodwalton Fen National Nature Reserve (NNR), Holme Fen NNR and other nature reserves to create a larger site with conservation benefits for wildlife and socio-economic benefits for people.
Upwood Meadows is a 6 hectare biological Site of Special Scientific Interest west of Upwood in Cambridgeshire. It is also a National Nature Reserve and a Grade I Nature Conservation Review site. It is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire.
Roswell Pits is an 8 hectare nature reserve on the eastern outskirts of Ely in Cambridgeshire. It is managed by the Environment Agency. It is part of the Ely Pits and Meadows Site of Special Scientific Interest (SSSI)) and Geological Conservation Review site. The SSSI designation for both biological and geological interest. The site was formerly managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire.
Woodwalton Marsh is a 0.8-hectare (2.0-acre) biological Site of Special Scientific Interest north-east of Woodwalton in Cambridgeshire. It is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire.
National nature reserves in Cambridgeshire, England are established by Natural England and managed by them or by non-governmental organisations such as the Royal Society for the Protection of Birds or the National Trust.
Ramsey Heights is a village in Ramsey civil parish, part of the Huntingdonshire district of Cambridgeshire, England.
Woodwalton Fen is a 209 hectare biological Site of Special Scientific Interest in the parish of Woodwalton, west of Ramsey in Huntingdonshire, Cambridgeshire, England. It is a Ramsar wetland site of international importance, a National Nature Reserve, a Special Area of Conservation and a Nature Conservation Review site, Grade I. The site is managed by Natural England.
Chippenham Fen and Snailwell Poor's Fen is a 155.9-hectare (385-acre) biological Site of Special Scientific Interest south-east of Fordham in Cambridgeshire, England. It is a Nature Conservation Review site, Grade I, a Ramsar wetland site and a Special Area of Conservation. It is managed by Natural England.
Upper Nene Valley Gravel Pits is a 1,382.4 hectare biological Site of Special Scientific Interest in a chain of flooded gravel pits along 35 kilometres of the valley of the River Nene between Northampton and Thorpe Waterville in Northamptonshire. It is a Ramsar wetland site of international importance, a Special Protection Area under the European Communities Birds Directive and part of the Nene Valley Nature Improvement Area. It is also part of the River Nene Regional Park. Two areas are managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire, Summer Leys and Titchmarsh Nature Reserve.
Fenland is a multi-site Special Area of Conservation in the Fens . It was designated in 2005 to protect three wetland sites in Cambridgeshire with an area of 619 ha:
Cranberry Rough is an 81.1-hectare (200-acre) biological and geological Site of Special Scientific Interest in the parish of Hockham, east of Attleborough in Norfolk. It is a Nature Conservation Review site, Grade 2, and the Great Eastern Pingo Trail, which is a Local Nature Reserve, goes through the site. Part of it is a Geological Conservation Review site, and it is part of the Breckland Special Protection Area.
Upper Thurne Broads and Marshes is a 1,185.9-hectare (2,930-acre) biological Site of Special Scientific Interest north of Great Yarmouth in Norfolk. Part of it is a Nature Conservation Review site, Grade I, and it is in the Norfolk Coast Area of Outstanding Natural Beauty. It is part of the Broadland Ramsar site and Special Protection Area, and The Broads Special Area of Conservation. Two areas, Hickling Broad and Martham Broad, are national nature reserves managed by the Norfolk Wildlife Trust.
Coordinates: 52°29′10″N0°13′26″W / 52.486°N 0.224°W