# List of local nature reserves in Hertfordshire

Hertfordshire is a county in eastern England. It is bordered by Bedfordshire to the north, Cambridgeshire to the north-east, Essex to the east, Buckinghamshire to the west and Greater London to the south. The county town is Hertford. As of June 2014, the county has a population of 1,154,800 in an area of 634 square miles (1,640 km$^2$).
Local nature reserves (LNRs) are designated by local authorities under the National Parks and Access to the Countryside Act 1949. The local authority must have legal control over the site, by owning or leasing it or having an agreement with the owner. LNRs are sites which have a special local interest either biologically or geologically, and local authorities have a duty to care for them. They can apply local bye-laws to manage and protect LNRs.
As of July 2015, forty-two LNRs in Hertfordshire have been notified to Natural England. The largest site is Therfield Heath with 147.3 hectares (364 acres). It has some of the richest chalk grassland in England, and it is also a Site of Special Scientific Interest (SSSI). The smallest is Oxleys Wood in Hatfield, which has an area of only 1.2 hectares (3.0 acres). This wood often floods, and it provides a habitat for a wide range of insects and birds. Several other sites are also SSSIs, such as Croxley Common Moor and Sherrardspark Wood. The oldest LNR in Hertfordshire listed by Natural England is Hilfield Park Reservoir, declared in 1969, and the newest Weston Hills in 2012.
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## Key
### Other classifications

* CAONB = Chilterns Area of Outstanding Natural Beauty
* HMWT = Herts and Middlesex Wildlife Trust
* SSSI = Site of Special Scientific Interest

## Sites

| Site | Area | Location | Map | Details | Other classifications | Description |
| Albans Wood | 4.1 hectares (10 acres) | Watford 51°41′39″N 0°23′54″W﻿ / ﻿51.6941°N 0.3983°W﻿ / 51.6941; -0.3983﻿ (Albans Wood) TL 108 007 | Map | Details | | The site is ancient semi-natural woodland. It is mainly oak with other trees such as beech, horse chestnut and sweet chestnut. Mammals include muntjac deer and noctule bats. |
| Batford Springs | 3.5 hectares (8.6 acres) | St Albans 51°49′22″N 0°20′19″W﻿ / ﻿51.8228°N 0.3386°W﻿ / 51.8228; -0.3386﻿ (Batford Springs) TL 146 151 | Map | Details | | The main feature of the reserve is a number of small springs which are the source of chalk streams and ponds. The River Lea runs through the site, and there is grassland and a small wood. |
| Cassiobury Park | 25.1 hectares (62 acres) | Watford 51°39′34″N 0°25′32″W﻿ / ﻿51.6594°N 0.4256°W﻿ / 51.6594; -0.4256﻿ (Cassiobury Park) TQ 090 968 | Map | Details | HMWT | This large park in Watford has a variety of habitats, including streams, ponds, watercress beds, wet grassland and wet woodland. The Grand Union Canal and River Gade run through the site. |
| Cheshunt Park | 40.0 hectares (99 acres) | Broxbourne 51°43′00″N 0°02′45″W﻿ / ﻿51.7167°N 0.04575°W﻿ / 51.7167; -0.04575﻿ (Cheshunt Park) TL 351 038 | Map | Details | | The history of the park goes back to Roman times. It is grass and woodland which has ancient hedgerows, wildflower meadows, a pond and an orchard which is cropped by traditional cattle breeds. |
| Chorleywood Common | 75.6 hectares (187 acres) | Three Rivers 51°39′15″N 0°30′40″W﻿ / ﻿51.6542°N 0.5110°W﻿ / 51.6542; -0.5110﻿ (Chorleywood Common) TQ 031 961 | Map | Details | CAONB | Some 300 fungi, 70 plant species and fifty birds have been recorded on the common, which has habitats including acid heathland, neutral grassland, chalk meadows and secondary woodland. |
| Chorleywood House Estate | 64.3 hectares (159 acres) | Three Rivers 51°39′47″N 0°30′08″W﻿ / ﻿51.6631°N 0.5021°W﻿ / 51.6631; -0.5021﻿ (Chorleywood House Estate) TQ 037 971 | Map | Details | | The River Chess runs through the estate, which has formal parkland surrounding a 200-year-old manor house, meadows and mature woodland. |
| Colney Heath | 22.5 hectares (56 acres) | St Albans 51°44′17″N 0°15′38″W﻿ / ﻿51.7380°N 0.2606°W﻿ / 51.7380; -0.2606﻿ (Colney Heath) TL 202 058 | Map | Details | | The site is acid grassland, which is unusual in Hertfordshire, and the River Colne runs through it. The heath is managed to maintain the grassland and the diversity of plant species along the river. |
| The Commons | 13.2 hectares (33 acres) | Welwyn Hatfield 51°47′01″N 0°10′34″W﻿ / ﻿51.7835°N 0.1762°W﻿ / 51.7835; -0.1762﻿ (The Commons, Welwyn Garden City) TL 259 110 | Map | Details | | The site has a variety of habitats including oak woodland, flower-rich meadows, wet fens, ditches and ponds. The meadows are grazed by livestock. |
| Croxley Common Moor | 41.2 hectares (102 acres) | Three Rivers 51°38′30″N 0°26′11″W﻿ / ﻿51.6416°N 0.4363°W﻿ / 51.6416; -0.4363﻿ (Croxley Common Moor) TQ 083 948 | Map | Details | SSSI | The site is mainly grass heathland with some ancient woodland and hazel coppice. Over 250 species of plants have been recorded. |
| Danesbury Park | 24.5 hectares (61 acres) | Welwyn Hatfield 51°50′14″N 0°13′03″W﻿ / ﻿51.8372°N 0.2176°W﻿ / 51.8372; -0.2176﻿ (Danesbury Park) TL 229 169 | Map | Details | | The site was formerly the park of Danesbury House, and it still has some large mature trees which are important to wildlife. Grassland areas, which are grazed by rare-breed cattle, have many varieties of flowering plants. |
| Fisher's Field | 1.8 hectares (4.4 acres) | Hertsmere 51°39′28″N 0°22′56″W﻿ / ﻿51.6579°N 0.3823°W﻿ / 51.6579; -0.3823﻿ (Fisher's Field) TQ 120 967 | Map | Details | | The area was allotments during the Second World War. There are areas of woodland, with trees including oak, rowan and wild cherry, and a wildflower meadow and scrub with bramble, raspberry and willow herb. Animals include green woodpeckers, shrews and bees. |
| Furzefield Wood and Lower Halfpenny | 7.4 hectares (18 acres) | Hertsmere 51°42′21″N 0°12′14″W﻿ / ﻿51.7057°N 0.2040°W﻿ / 51.7057; -0.2040﻿ (Furzefield Wood and Lower Halfpenny) TL 242 023 | Map | Details | | The wood has been managed for coppicing for over 300 years. It now provides a habitat for birds, and fallen branches are important for invertebrates. Lower Halfpenny is a meadow which was once the route of an old drovers' track. |
| Garston Park | 6.4 hectares (16 acres) | Watford 51°41′28″N 0°22′47″W﻿ / ﻿51.6912°N 0.3796°W﻿ / 51.6912; -0.3796﻿ (Garston Park) TL 121 004 | Map | Details | | The nature reserve has woodland which is mainly oak, ash and sycamore, and there are also areas of grassland and wetland. Mammals include muntjac deer and pipistrelle bats. |
| Harebreaks Wood | 5.1 hectares (13 acres) | Watford 51°40′51″N 0°24′32″W﻿ / ﻿51.6808°N 0.4089°W﻿ / 51.6808; -0.4089﻿ (Harebreaks Wood) TQ 101 992 | Map | Details | | The site is semi-natural woodland of oak, ash and cherry, which goes back to at least 1600. Birds include treecreeper and nuthatch, and there mammals such as muntjac deer and pipistrelle bats. |
| Hilfield Park Reservoir | 74.7 hectares (185 acres) | Hertsmere 51°38′57″N 0°19′39″W﻿ / ﻿51.6491°N 0.3276°W﻿ / 51.6491; -0.3276﻿ (Hilfield Park Reservoir) TQ 158 958 | Map | Details | HMWT | This large reservoir is of national importance for pochards, tufted ducks and common tern. The margins have marshy areas with many breeding birds and marsh plants, such as reedmace and reed canarygrass. |
| Howe Dell | 4.0 hectares (9.9 acres) | Welwyn Hatfield 51°45′26″N 0°13′20″W﻿ / ﻿51.7572°N 0.2222°W﻿ / 51.7572; -0.2222﻿ (Howe Dell) TL 228 080 | Map | Details | | The site is woodland which runs along both sides of a stream with steep sides. The main trees are hornbeam, oak and beech. |
| Howe Grove Wood | 8.5 hectares (21 acres) | Dacorum 51°45′58″N 0°28′00″W﻿ / ﻿51.7661°N 0.4668°W﻿ / 51.7661; -0.4668﻿ (Howe Grove Wood) TL 059 086 | Map | Details | | This site is dense woodland next to the A4147 road in Hemel Hempstead. |
| Ivel Springs | 15.4 hectares (38 acres) | North Hertfordshire 51°59′39″N 0°11′38″W﻿ / ﻿51.9942°N 0.1939°W﻿ / 51.9942; -0.1939﻿ (Ivel Springs) TL 241 344 | Map | Details | | The site, which was a rubbish dump until the 1950s, has habitats including woodland, wetland and pasture. Its springs are the source of the River Ivel, and they have a wide variety of wildlife. |
| The Lairage Land | 4.4 hectares (11 acres) | Watford 51°38′41″N 0°24′21″W﻿ / ﻿51.6448°N 0.4059°W﻿ / 51.6448; -0.4059﻿ (The Lairage Land) TQ 104 952 | Map | Details | | The site is mainly rough grassland, with some woodland and scrub. The River Colne runs along its southern boundary, with stream water crowfoot and yellow water lily growing in the water. A notable insect is Roesel's bush-crickets. |
| Mardley Heath | 41.1 hectares (102 acres) | Welwyn Hatfield 51°50′58″N 0°11′33″W﻿ / ﻿51.8494°N 0.1925°W﻿ / 51.8494; -0.1925﻿ (Mardley Heath) TL 246 183 | Map | Details | | In the middle of the twentieth century the heath was used for gravel extraction, and it is now regenerating naturally. Oak and hornbeam woodland around the perimeter remains, and it is managed to enhance biodiversity. |
| Marshalls Heath | 4.0 hectares (9.9 acres) | St Albans 51°49′15″N 0°19′01″W﻿ / ﻿51.8207°N 0.3169°W﻿ / 51.8207; -0.3169﻿ (Marshalls Heath) TL 161 149 | Map | Details | | The site is secondary woodland and scrub on acid heathland, but the many species recorded include forty on national lists of threatened species. It is one of the key Hertfordshire sites for butterflies and moths. |
| Northaw Great Wood Country Park | 120.7 hectares (298 acres) | Welwyn Hatfield 51°43′22″N 0°08′28″W﻿ / ﻿51.7227°N 0.14105304°W﻿ / 51.7227; -0.14105304﻿ (Northaw Great Wood Country Park) TL 285 043 | Map | Details | SSSI | The park has one of the county's most extensive areas of ancient hornbeam woodland, with other trees including oak and silver birch. Glades, streams and springs add to the biodiversity. |
| Norton Common | 25.7 hectares (64 acres) | North Hertfordshire 51°59′05″N 0°13′40″W﻿ / ﻿51.9848°N 0.2278°W﻿ / 51.9848; -0.2278﻿ (Norton Common) TL 218 333 | Map | Details | | Woodland on this site has diverse wildlife including black squirrels, muntjac deer, and birds such as chiff chaffs and blackcaps. There are also meadows with wild flowers, and the Pix Brook, which is fed by mineral-rich springs. |
| Oughtonhead Common | 17.4 hectares (43 acres) | North Hertfordshire 51°57′39″N 0°18′05″W﻿ / ﻿51.9607°N 0.3015°W﻿ / 51.9607; -0.3015﻿ (Oughtonhead Commo) TL 168 305 | Map | Details | | The common is part of the Chilterns Area of Outstanding Natural Beauty. It has a wide variety of habitats, and the River Oughton flows along the edge. English Longhorn cattle graze pasture areas. |
| Oxhey Woods | 100.2 hectares (248 acres) | Three Rivers 51°37′27″N 0°24′29″W﻿ / ﻿51.6241°N 0.4080°W﻿ / 51.6241; -0.4080﻿ (Oxhey Woods) TQ 103 929 | Map | Details | | The site is mainly semi-natural woodland, and some areas date back to the end of the last Ice Age, the Younger Dryas, 11,500 years ago. Plants include bluebells, anemones and violets and the rare wild service tree. |
| Oxleys Wood | 1.2 hectares (3.0 acres) | Welwyn Hatfield 51°45′03″N 0°13′24″W﻿ / ﻿51.7509°N 0.2232°W﻿ / 51.7509; -0.2232﻿ (Oxleys Wood) TL 227 073 | Map | Details | | The wood floods in wet weather, particularly the northern part, which has a pond. Tree species include oak, ash, elm and willow, and they provide a habitat for insects which provide food for birds. |
| Prestwick Road Meadows | 2.8 hectares (6.9 acres) | Three Rivers 51°37′03″N 0°23′17″W﻿ / ﻿51.6176°N 0.3880°W﻿ / 51.6176; -0.3880﻿ (Prestwick Road Meadows) TQ 117 922 | Map | Details | | This site was formerly farm meadows. It has many insects and flowers include purple knapweed, yellow birdsfoot-trefoil and red clover. Old hedgerows still survive, and there is also a seasonal pond where frogs breed in the spring. |
| Purwell Meadows | 8.6 hectares (21 acres) | North Hertfordshire 51°57′14″N 0°15′19″W﻿ / ﻿51.9538°N 0.2552°W﻿ / 51.9538; -0.2552﻿ (Purwell Meadows) TL 200 298 | Map | Details | | The River Purwell runs through the meadows. Wildlife includes kingfishers, which are native to the area, and water voles. |
| Rickmansworth Aquadrome | 41.0 hectares (101 acres) | Three Rivers 51°37′59″N 0°28′43″W﻿ / ﻿51.6331°N 0.4785°W﻿ / 51.6331; -0.4785﻿ (Rickmansworth Aquadrome) TQ 054 938 | Map | Details | | There are two lakes and a diverse range of wildlife habitats. The site has trees such as oaks and willows, birds including herons and moorhens, and small copper and gatekeeper butterflies. |
| Sherrardspark Wood | 73.2 hectares (181 acres) | Welwyn Hatfield 51°48′37″N 0°13′02″W﻿ / ﻿51.8102°N 0.2172°W﻿ / 51.8102; -0.2172﻿ (Sherrardspark Wood) TL 230 139 | Map | Details | SSSI | Much of this site is sessile oak woodland. Some trees are 250 years old, and diverse flora includes violet and broad-leaved helleborine, both of which are rare. |
| Shrubhill Common | 9.8 hectares (24 acres) | Dacorum 51°45′14″N 0°30′07″W﻿ / ﻿51.7539°N 0.5020°W﻿ / 51.7539; -0.5020﻿ (Shrubhill Common) TL 035 072 | Map | Details | CAONB | The common is woodland and scrub, together with two fields which are chalk grassland. There are over 100 species of wild flowers, and herbs such as marjoram and basil. |
| Singlers Marsh | 6.3 hectares (16 acres) | Welwyn Hatfield 51°50′07″N 0°13′14″W﻿ / ﻿51.8354°N 0.2206°W﻿ / 51.8354; -0.2206﻿ (Singlers Marsh) TL 227 167 | Map | Details | | The River Mimram runs along the edge of this site. It has grassland, which is managed by cattle grazing and cutting, and areas of willow scrub with some more mature trees. |
| Stanborough Reedmarsh | 3.3 hectares (8.2 acres) | Welwyn Hatfield 51°48′37″N 0°13′02″W﻿ / ﻿51.8102°N 0.2172°W﻿ / 51.8102; -0.2172﻿ (Stanborough Reedmarsh) TL 230 139 | Map | Details | HMWT | The site is wet willow woodland on the bank of the River Lea. It is important for water voles and birds such as reed and sedge warblers. Water figwort, common meadow rue and water chickweed grow along the river bank. |
| Stocker's Lake | 37.9 hectares (94 acres) | Three Rivers 51°37′47″N 0°29′19″W﻿ / ﻿51.6297°N 0.4887°W﻿ / 51.6297; -0.4887﻿ (Stockers Lake) TQ 047 934 | Map | Details | HMWT | This is an old flooded gravel pit which has over sixty species of breeding birds, including shoveler and goldeneye ducks in nationally important numbers. |
| Therfield Heath | 147.3 hectares (364 acres) | North Hertfordshire 52°02′32″N 0°03′18″W﻿ / ﻿52.0423°N 0.05491°W﻿ / 52.0423; -0.05491﻿ (Therfield Heath) TL 335 400 | Map | Details | SSSI | This is unimproved pasture and has some of the richest chalk grassland in England. Plants include the rare pasque flower, and there are insects such as the chalkhill blue butterfly. |
| Top Field and Cozens Grove | 6.1 hectares (15 acres) | Broxbourne 51°44′30″N 0°01′54″W﻿ / ﻿51.7416°N 0.03164°W﻿ / 51.7416; -0.03164﻿ (Top Field and Cozens Grove) TL 360 066 | Map | Details | | Top Field is a wildflower meadow which is mown to provide a habitat for small mammals, birds and insects. Cozens Grove is an ancient wood which has coppiced hornbeam and a medieval sunken ditch. |
| Watercress Wildlife Site | 1.2 hectares (3.0 acres) | St Albans 51°44′37″N 0°19′58″W﻿ / ﻿51.7436°N 0.3328°W﻿ / 51.7436; -0.3328﻿ (Watercress Wildlife Site) TL 152 063 | Map | Details | | The site was formerly one of the many commercial watercress beds in the area. It has a wide variety of wildlife, including water rails, kingfishers, little grebes and muntjac deer. |
| Waterford Heath | 35.2 hectares (87 acres) | East Hertfordshire 51°49′05″N 0°05′32″W﻿ / ﻿51.8181°N 0.09215°W﻿ / 51.8181; -0.09215﻿ (Waterford Heath) TL 316 150 | Map | Details | HMWT | The site is mainly grassland, with areas of scrub, wood plantation and semi-natural woodland. Breeding birds include skylarks and willow warblers, and there are reptiles such as slow worms and grass snakes. |
| Weston Hills | 17.0 hectares (42 acres) | North Hertfordshire 51°48′15″N 0°10′55″W﻿ / ﻿51.8042°N 0.18189°W﻿ / 51.8042; -0.18189﻿ (Weston Hills) TL 250 326 | Map | Details | | Chalk grassland is its most important ecological feature and one of the best examples in Hertfordshire; plants are very diverse because the harsh conditions do not allow vigorous species to become dominant. |
| Wheathampstead | 5.9 hectares (15 acres) | St Albans 51°48′15″N 0°10′55″W﻿ / ﻿51.8042°N 0.18188°W﻿ / 51.8042; -0.18188﻿ (Wheathampstead) TL 177 131 | Map | Details | | This L-shaped site has ash woodland, thorn scrub, mature hedgerows, and rough grassland. There are plants such as grass vetchling and bee orchid, birds including yellowhammer and whitethroat, and many butterflies. |
| The Wick | 3.4 hectares (8.4 acres) | St Albans 51°45′43″N 0°18′39″W﻿ / ﻿51.7619°N 0.3108°W﻿ / 51.7619; -0.3108﻿ (The Wick, St Albans) TL 166 083 | Map | Details | | This is ancient woodland which is semi-natural, and the main trees are oak and hornbeam. Other features are a seasonal pond and historic field boundaries of bank and ditch. |
| The Withey Beds | 7.5 hectares (19 acres) | Three Rivers 51°38′04″N 0°26′38″W﻿ / ﻿51.6345°N 0.4438°W﻿ / 51.6345; -0.4438﻿ (The Withey Beds) TQ 078 940 | Map | Details | | The site borders the River Colne, and it has a variety of habitats including dry grassland, wet woodland, marsh and ditches. A World War II pillbox has been turned into a bat roost. |