| Site | Photograph | District | Area[a] | Location[b] | Map[c] | Details[d] | Description |
| Barrington Hill |  | South Somerset | 17.8 hectares (44.0 acres) | Broadway
50°56′53″N 2°59′49″W / 50.948°N 2.997°W / 50.948; -2.997 (Barrington Hill)
ST300170 | Map | Details | This site comprises four meadows surrounded by well-established hedges on gently sloping clay-rich soils. It is an outstanding example of a traditionally managed unimproved neutral grassland of a type now rare in Britain. The meadows belong to a type characterised by the widespread occurrence of sweet vernal grass (Anthoxanthum odoratum), crested dog's-tail (Cynosurus cristatus), cowslip (Primula veris) and green-winged orchid (Orchis morio). A total of 74 species of orchids have so far been recorded. This site is one of only three localities in Britain in which the grass Gaudinia fragilis is a prominent feature of the sward.[3] |
| Bridgwater Bay |  | Sedgemoor | 2,639 hectares (6,521 acres) | Otterhampton
51°10′59″N 3°04′48″W / 51.183°N 3.080°W / 51.183; -3.080 (Bridgwater Bay)
ST246431 | Map | Details | Bridgwater Bay is on the Bristol Channel, 5 kilometres (3.1 mi) north of Bridgwater at the mouth of the River Parrett and the end of the River Parrett Trail. It consists of large areas of mud flats, saltmarsh, sandflats and shingle ridges, some of which are vegetated. It has been designated as a Site of Special Scientific Interest since 1989,[4] and is designated as a wetland of international importance under the Ramsar Convention.[5] In addition to the rivers, Parrett, Brue and Washford several of the man-made drainage ditches, including the River Huntspill, from the Somerset Levels, including the "Pawlett Hams", also drain into the bay. |
| Dunkery and Horner Wood |  | West Somerset | 1,604 hectares (3,964 acres) | Luccombe
51°11′20″N 3°33′32″W / 51.189°N 3.559°W / 51.189; -3.559 (Dunkery and Horner Wood)
SS910445 | Map | Details | The Dunkery and Horner Wood NNR is one of the largest in England. It includes Dunkery Hill, the highest point on Exmoor and in Somerset, wet and dry heathland, ancient woodland and open grassland. Much of the NNR is within the National Trust-owned Holnicote Estate.[6] |
| Ebbor Gorge |  | Mendip | 47 hectares (116 acres) | St Cuthbert Out
51°14′02″N 2°40′55″W / 51.234°N 2.682°W / 51.234; -2.682 (Ebbor Gorge)
ST525485 | Map | Details | Ebbor Gorge is a limestone gorge. It was donated to the National Trust in 1967 and is now managed by Natural England. The gorge was cut into the Clifton Down Limestone, an example of Carboniferous Limestone, by water. The floor of the gorge is impermeable Millstone Grit and Lower Coal Measures.[7][8] The rare mineral mendipite has also been found.[9] The site was occupied by humans in the Neolithic Era and their tools and flint arrow heads have been discovered, along with pottery from the Bronze Age.[10][11][12] There are also fossils of small mammals from the end of the last ice age. The nature reserve provides a habitat for a variety of flora and fauna, including flowers, butterflies and bats.[13] |
| Gordano Valley |  | North Somerset | 126 hectares (311 acres) | Walton in Gordano
51°27′11″N 2°48′50″W / 51.453°N 2.814°W / 51.453; -2.814 (Gordano Valley)
ST433731 | Map | Details | A Site of Special Scientific Interest, for ornithological, entomological and stratigraphic interest. Several sites in the valley are managed by the Avon Wildlife Trust as nature reserves. These include; Weston Big Wood, Clapton Moor, Weston Moor and Walton Common. The unimproved wet meadow communities largely consist of variants of the nationally rare blunt-flowered rush–marsh thistle (Juncus subnodulosus–cirsium palustre), soft/sharp flowered rush–marsh bedstraw (Juncus effusus/acutiflorus–Galium palustre), purple moorgrass–meadow thistle (Molinia caerulea–cirsium dissectum) and crested dog's-tail–common knapweed (Cynosurus cristatus–centaurea nigra) community types. In total over 130 species of flowering plant have been recorded including 3 species of orchids, 21 grasses and 14 sedges. The extensive system of rhynes and field ditches contains a rich flora which includes three nationally scarce species: water parsnip (Sium latafolium), whorled water milfoil (Myriophyllum verticillatum) and fen pondweed (Potamogeton coloratus).[14] |
| Ham Wall |  | Mendip | 87.27 hectares (215.6 acres) | Sharpham
51°09′18″N 2°40′55″W / 51.155°N 2.682°W / 51.155; -2.682 (Ham Wall)
ST525485 | Map | Details | The Ham Wall national nature reserve, 4 kilometres (2.5 mi) west of Glastonbury, on the Somerset Levels in the valley of the River Brue is managed by the Royal Society for the Protection of Birds.[15][16] It is part of the Brue Valley Living Landscape conservation project which aims to restore, recreate and reconnect habitat. This new wetland habitat has been established from out peat diggings and now consists of areas of reedbed, wet scrub, open water and peripheral grassland and woodland. Many bird species live on or visit the site including the bearded tit, bittern, Cetti's warbler, hobby and starling.[17] |
| Hardington Moor |  | South Somerset | 8.7 hectares (21.5 acres) | Hardington Mandeville
50°54′50″N 2°41′28″W / 50.914°N 2.691°W / 50.914; -2.691 (Hardington Moor)
ST515130 | Map | Details | Hardington Moor is a biological Site of Special Scientific Interest between Hardington Mandeville and West Coker, notified in 1994. Hardington Moor national nature reserve covers partly calcareous clay-rich soils on sloping ground and comprises three meadows surrounded by established hedges. The meadows are examples of species-rich unimproved neutral grassland, which is now nationally rare. The rare French oat-grass is very abundant on the site and the fields are home to a wide variety of plant species, most notably adder's tongue, corky-fruited water-dropwort and large numbers of green-winged orchid. Invertebrates found at the site include butterflies such as gatekeeper, small tortoiseshell and common blue. Less commonly seen are large skipper, green-veined white and green hairstreak.[18] |
| Hawkcombe Woods |  | West Somerset | 98 hectares (242 acres) | Porlock
51°12′07″N 3°35′35″W / 51.202°N 3.593°W / 51.202; -3.593 (Hawkcombe Woods)
SS886459 | Map | Details | Hawkcombe Woods is near Porlock on Exmoor.[19] The 101 hectares (249.6 acres) woodlands are notable for their lichens, heath fritillary butterfly, red wood ant colonies, dead wood invertebrates and ancient pollards.[20] They are part of the North Exmoor Site of Special Scientific Interest. |
| Huntspill River |  | Sedgemoor | 149 hectares (368 acres) | East Huntspill
51°12′29″N 3°00′50″W / 51.208°N 3.014°W / 51.208; -3.014 (Huntspill River)
ST291459 | Map | Details | The River Huntspill (or Huntspill River) is an artificial river, in the Somerset Levels. It was built in 1940 to supply process water to ROF Bridgwater, and has resulted in reduced flooding of the lower Brue Valley. Huntspill Sluice at the river's western end, also known as West Huntspill Sluice, separates it from the River Parrett. A stretch of the river, from Gold Corner to Huntspill Sluice (excluding the Cripps River), is a national nature reserve. The NNR is managed by the Environment Agency. The river discharges into the River Parrett, just south of Highbridge which then flows into Bridgwater Bay.[21] Public access to the site is restricted. |
| Leigh Woods |  | North Somerset | 64 hectares (158 acres) | Leigh Woods
51°27′47″N 2°38′20″W / 51.463°N 2.639°W / 51.463; -2.639 (Leigh Woods)
ST559733 | Map | Details | Leigh Woods is an area of woodland on the south-west side of the Avon Gorge, close to the Clifton Suspension Bridge, within North Somerset opposite the English city of Bristol and north of the Ashton Court estate, of which it formed a part. In 1909 part of the woodland was donated to the National Trust by George Alfred Wills, to prevent development of the city beside the gorge following the building of the Leigh Woods suburb. Areas not owned by the National Trust have since been taken over by the Forestry Commission. It is included in the Avon Gorge Site of Special Scientific Interest,[22][23] Rare trees include multiple species of Sorbus with at least nine native and four imported species. Bristol rockcress (Arabis scabra) which is unique to the Avon Gorge can be seen flowering in April; various species of orchids and western spiked speedwell (Veronica spicata) are common in June and July. |
| Rodney Stoke |  | Mendip | 51 hectares (126 acres) | Rodney Stoke
51°15′11″N 2°43′44″W / 51.253°N 2.729°W / 51.253; -2.729 (Rodney Stoke)
ST492507 | Map | Details | Rodney Stoke is a biological Site of Special Scientific Interest, just north of the village of Rodney Stoke in the Mendip Hills. Part of the site is a national nature reserve and part a Nature Conservation Review Woodland site. This site supports a mosaic of ancient semi-natural broadleaved woodland, scrub and species-rich unimproved grassland. Two nationally rare plants occur at Rodney Stoke: purple gromwell (Lithospermum purpurocaeruleum) and the endemic whitebeam (Sorbus anglica). The site supports a diverse fauna. Badgers (Meles meles) are common and two or three setts are occupied each year. Noctule bats (Nyctalus noctula) and pipistrelle bats (Pipistrellus pipistrellus) roost in Big Stoke. Breeding birds include buzzard (Buteo buteo) and spotted flycatcher (Muscicapa striata). Small enclosures and tall hedges provide sheltered conditions that are ideal for many species of invertebrate. Butterflies are well represented with marbled white (Melanargia galathea), purple hairstreak (Quercusia quercus), brown argus (Aricia agestis) and grayling (Hipparchia semele).[24] General access is only via the one footpath across the site. |
| Shapwick Heath |  | Sedgemoor | 509 hectares (1,258 acres) | Shapwick
51°09′32″N 2°48′50″W / 51.159°N 2.814°W / 51.159; -2.814 (Shapwick Heath)
ST436400 | Map | Details | Shapwick Heath is a biological Site of Special Scientific Interest and national nature reserve[25] between Shapwick and Westhay. It is part of the Brue Valley Living Landscape conservation project. Shapwick Heath, part of the Avalon Marshes in the Somerset Levels Wetlands, and managed as a national nature reserve by Natural England, is a former raised bog lying in the basin of the River Brue. The site supports a diverse community of terrestrial and aquatic invertebrates. National rarities are the greater silver diving beetle (Hydrophilus piceus) and the lesser silver diving beetle (Hydrochara caraboides) which is now confined nationally to the Brue Basin Peat Moors.[26] |
| Somerset Levels |  | Sedgemoor | 463 hectares (1,144 acres) | Moorlinch
51°07′16″N 2°52′55″W / 51.121°N 2.882°W / 51.121; -2.882 (Somerset Levels)
ST383361 | Map | Details | The Somerset Levels national nature reserve covers several areas of the wider Somerset Levels. The specific sites include the Moorlinch SSSI, Southlake Moor and part of King's Sedgemoor. The habitats covered are open water and lowland grassland which are frequented by resident and visiting birds.[27] The water table is high for most of the year with frequent winter flooding from high ground and surface water remaining on many fields throughout the winter and early spring. Moorlinch contains a good proportion of botanically rich ditch systems.[28] Public access is restricted. |
| Tarr Steps Woodland |  | West Somerset | 33.4 hectares (82.5 acres) | Winsford
51°04′37″N 3°37′05″W / 51.077°N 3.618°W / 51.077; -3.618 (Tarr Steps Woodland)
SS863324 | Map | Details | Owned by Exmoor National Park Authority, Tarr Steps Woodland national nature reserve covers 33 hectares of the River Barle valley. This is mainly sessile oak (Quercus petraea) woodland, with beech (Fagus), ash, sycamore (Acer pseudoplatanus), hazel (Corylus), blackberry (Rubus), bluebells (Hyacinthoides non-scripta) and honeysuckle (Lonicera).[29] It is internationally significant[30] for the mosses, liverworts and lichens which flourish in the cool damp conditions.[31][32] Much of the woodland was once coppiced, primarily to provide charcoal for the local iron smelting industry. The river and the valley woodlands are part of the Barle Valley Site of Special Scientific Interest and abound with wildlife, ranging from red deer to dormice, including the rare barbastelle bat (Barbastella barbastellus) and otter that feed along the unpolluted and fast-flowing river.[33] |
| Westhay Moor |  | Mendip | 105 hectares (259 acres) | Meare
51°11′49″N 2°46′52″W / 51.197°N 2.781°W / 51.197; -2.781 (Westhay Moor)
ST454443 | Map | Details | Westhay Moor is a biological Site of Special Scientific Interest and notified as part of the Somerset Levels and Moors Special Protection Area under the EU Birds Directive and as a Ramsar Site.[34] The low-lying swampy area of Westhay Moor has had peat laid down over older rocks for the last 10,000 years. Peat extraction on the Somerset Levels has occurred since the area was first drained by the Romans.[35] Measures to improve the drainage were carried out in the Middle Ages largely by Glastonbury Abbey.[36] In the 17th and 18th centuries further drainage work was undertaken including digging a series of rhynes, or ditches and larger drainage canals.[37][38][39] Peat extraction peaked in the 1960s but has since declined.[40][41] The geology of the moor and prolonged peat extraction has provided a unique environment which provides a habitat for a range of flora and fauna.[42] Much of the nature reserve managed by the Somerset Wildlife Trust is based around abandoned peatworkings which have now become flooded.[43][44][45] It is particularly noted for the millions of starlings which congregate at the site.[46][47][48] |
