Rowley Green Common is a six hectare Local Nature Reserve and a Site of Importance Metropolitan for Nature Conservation in Arkley, north London. It is owned by the London Borough of Barnet. It is also registered common land.
Croxley Common Moor is a 39.5-hectare (98-acre) biological Site of Special Scientific Interest (SSSI) and Local Nature Reserve in Croxley Green, Hertfordshire. It is owned by Three Rivers District Council and managed by the council together with the Countryside Management Service and the Friends of Croxley Common Moor. Most of it is a registered common.
Northaw Great Wood is a 223.6-hectare (553-acre) biological Site of Special Scientific Interest (SSSI) near Cuffley in Hertfordshire, England. It covers Northaw Great Wood Country Park, which is managed by Welwyn Hatfield Borough Council, Well Wood, Justice Hill and Grimes Bottom. Part of the site is managed by Hertfordshire County Council as a schools' park. The country park is also a local nature reserve.
Waterford Heath is a 35.2 hectare Local Nature Reserve in Waterford in Hertfordshire, England. It is owned by Lafarge Tarmac and managed by the Herts and Middlesex Wildlife Trust together with East Hertfordshire District Council and Lafarge.
Chorleywood Common is a 75.6 hectare Local Nature Reserve in Chorleywood in Hertfordshire. It is owned and managed by Chorleywood Parish Council, and the declaring authority is Hertfordshire County Council. The common is part of the Chilterns Area of Outstanding Natural Beauty.
Furzefield Wood and Lower Halfpenny is a 7.4 hectare Local Nature Reserve in Potters Bar in Hertfordshire. It is owned and managed by Hertsmere Borough Council.
Ivel Springs is a 15.4 hectare Local Nature Reserve in Baldock in Hertfordshire. It is owned and managed by North Hertfordshire District Council, assisted by the Friends of Baldock Green Spaces.
Mardley Heath is a 41.1 hectare Local Nature Reserve in Welwyn in Hertfordshire. It is owned by Welwyn Hatfield Borough Council and managed by the council together with the Friends of Mardley Heath.
Oughtonhead Common is a 17.4 hectare Local Nature Reserve in the Westmill district of Hitchin, Hertfordshire. It is owned and managed by North Hertfordshire District Council. and home to the Oughtonhead Common nature reserve.
Rickmansworth Aquadrome is a 41-hectare (101-acre) public park and Local Nature Reserve in Rickmansworth in Hertfordshire. It is owned and managed by Three Rivers District Council.
Hertford Heath nature reserve is a 28 hectare biological Site of Special Scientific Interest in Hertford Heath in Hertfordshire. It is managed by the Herts and Middlesex Wildlife Trust and the local planning authority is East Hertfordshire District Council.
Stanborough Reedmarsh is a 3.3 hectare Local Nature Reserve in Welwyn Garden City in Hertfordshire. It is owned by Welwyn Hatfield Borough Council and managed by the Herts and Middlesex Wildlife Trust.
Cheshunt Park is a 40 hectare public park and Local Nature Reserve in Cheshunt in Hertfordshire. It is owned and managed by Broxbourne Borough Council.
Shrubhill Common is a 9.8 hectare Local Nature Reserve in Hemel Hempstead in Hertfordshire, England. It was Dacorum's first Local Nature reserve, its LNR status being declared on 10 October 1995. and it is still owned and managed by Dacorum Borough Council. The site is common land, and it is part of the Chilterns Area of Outstanding Natural Beauty.
Purwell Meadows is an 8.6-hectare (21-acre) nature reserve in Hitchin, Hertfordshire, England. It was declared a Local Nature Reserve in 1994. It is owned and managed by North Hertfordshire District Council.
Batchworth Heath is 4 hectares of designated common land in Rickmansworth, Hertfordshire, around the junction of Batchworth Heath Hill, Batchworth Lane and White Hill, owned and managed by Three Rivers District Council. The habitat is heathland with an ancient pond and rich wildlife. Since July 2015 the site has been listed by Natural England as a Local Nature Reserve, but according to Three Rivers Council this is an error and they have asked Natural England to remove it from the list.
Weston Hills is a 17 hectare Local Nature Reserve in Baldock in North Hertfordshire. It is owned by Hertfordshire County Council and North Hertfordshire District Council (NHDC) and managed by NHDC.
Hill End Pit is a 0.7-hectare (1.7-acre) nature reserve on the site of a former chalk pit, in St Paul's Walden in North Hertfordshire. It was formerly managed by the Herts and Middlesex Wildlife Trust (HMWT). In February 2016 HMWT announced that three sites, Barkway Chalk Pit, Hill End Pit and Pryor's Wood, which HMWT managed on behalf of their owner, North Hertfordshire District Council, were to return to Council management as the Trust was no longer able to meet the cost. It has the largest colony of Azeca goodalli snails in Hertfordshire. Plants include viper's bugloss, cowslip and marjoram, there are butterflies such as common blue and gatekeeper, and many birds including woodpeckers.
Marshalls Heath is a hamlet and a 4-hectare (10-acre) Local Nature Reserve in Wheathampstead parish, Hertfordshire, England. The nature reserve is owned by Wheathampstead Parish Council and managed by the council together with the Friends of Marshalls Heath. It was purchased from The Queen's College, Oxford, in 1966.
