Crymlyn Bog ( cy, Cors Crymlyn) is a

nature reserve A nature reserve (also known as a wildlife refuge, wildlife sanctuary, biosphere reserve or bioreserve, natural or nature preserve, or nature conservation area) is a protected area of importance for flora, fauna, or features of geological or ...

and a designated Site of Special Scientific Interest of international significance, near Swansea, south

Wales Wales ( cy, Cymru ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, east, the Irish Sea to the north and west, the Celtic Sea to the south west and the ...

. It is the largest area of lowland

fen A fen is a type of peat-accumulating wetland fed by mineral-rich ground or surface water. It is one of the main types of wetlands along with marshes, swamps, and bogs. Bogs and fens, both peat-forming ecosystems, are also known as mires. T ...

in Wales and lies immediately to the eastern side of

Kilvey Hill Kilvey Hill (Welsh: ''Mynydd Cilfái'' or ''Y Bigwrn'') is a hill in South Wales, to the east of Swansea. Kilvey Hill is high and is classed as a Sub Marilyn. The top of Kilvey Hill enjoys panoramic views of Swansea city centre, Swansea Dock ...

just north of the industrial area of

Crymlyn Burrows Crymlyn Burrows () is an area of land in Wales, UK to the east of Swansea city centre, and south of Crymlyn Bog. It is bounded by Jersey Marine Beach to the south and the River Neath to the east. The land west of Baldwin's Crescent falls withi ...

. Plantlife found in the

bog A bog or bogland is a wetland that accumulates peat as a deposit of dead plant materials often mosses, typically sphagnum moss. It is one of the four main types of wetlands. Other names for bogs include mire, mosses, quagmire, and muskeg; a ...

is more typical of that found in

East Anglia East Anglia is an area in the East of England, often defined as including the counties of Norfolk, Suffolk and Cambridgeshire. The name derives from the Anglo-Saxon kingdom of the East Angles, a people whose name originated in Anglia, in ...

. Habitats range from

swamps A swamp is a forested wetland.Keddy, P.A. 2010. Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK. 497 p. Swamps are considered to be transition zones because both land and water play a role in ...

, carr (fen), water

meadows A meadow ( ) is an open habitat, or field, vegetated by grasses, herbs, and other non-woody plants. Trees or shrubs may sparsely populate meadows, as long as these areas maintain an open character. Meadows may be naturally occurring or artifici ...

and tall

reed bed A reedbed or reed bed is a natural habitat found in floodplains, waterlogged depressions and estuaries. Reedbeds are part of a succession from young reeds colonising open water or wet ground through a gradation of increasingly dry ground. As ...

s to waterlogged

scrub Scrub(s) may refer to: * Scrub, low shrub and grass characteristic of scrubland * Scrubs (clothing), worn by medical staff * ''Scrubs'' (TV series), an American television program * Scrubs (occupation), also called "scrub tech," "scrub nurse," ...

consisting mainly of

willow Willows, also called sallows and osiers, from the genus ''Salix'', comprise around 400 speciesMabberley, D.J. 1997. The Plant Book, Cambridge University Press #2: Cambridge. of typically deciduous trees and shrubs, found primarily on moist ...

, where wetter areas merge with

woodland A woodland () is, in the broad sense, land covered with trees, or in a narrow sense, synonymous with wood (or in the U.S., the '' plurale tantum'' woods), a low-density forest forming open habitats with plenty of sunlight and limited shade (see ...

. There are a number of plants found in the wetland that are rare in

Great Britain Great Britain is an island in the North Atlantic Ocean off the northwest coast of continental Europe. With an area of , it is the largest of the British Isles, the largest European island and the ninth-largest island in the world. It is ...

. Examples of these include the slender

cotton grass ''Eriophorum'' (cottongrass, cotton-grass or cottonsedge) is a genus of flowering plants in the family Cyperaceae, the sedge family. They are found throughout the arctic, subarctic, and temperate portions of the Northern Hemisphere in acid bog ...

and lesser water plantain. In 2003, surveys of Crymlyn Bog, Pant-y-Sais Fen and the inter-connecting wetlands identified the area as one of only three locations in the UK at which the fen raft spider is found. The extent of the population is unknown but the quality of habitat at the site is considered good enough for the population to be stable. The reserve is a haven for birds. Predatory visitors like the

hen harrier The hen harrier (''Circus cyaneus'') is a bird of prey. It breeds in Eurasia. The term "hen harrier" refers to its former habit of preying on free-ranging fowl. It migrates to more southerly areas in winter. Eurasian birds move to southern Eu ...

buzzard Buzzard is the common name of several species of birds of prey. ''Buteo'' species * Archer's buzzard (''Buteo archeri'') * Augur buzzard (''Buteo augur'') * Broad-winged hawk (''Buteo platypterus'') * Common buzzard (''Buteo buteo'') * Eastern ...

hobby A hobby is considered to be a regular activity that is done for enjoyment, typically during one's leisure time. Hobbies include collecting themed items and objects, engaging in creative and artistic pursuits, playing sports, or pursuing ...

and the occasional

marsh harrier The marsh harriers are birds of prey of the harrier subfamily. They are medium-sized raptors and the largest and broadest-winged harriers. Most of them are associated with marshland and dense reedbeds. They are found almost worldwide, excluding o ...

visit the site regularly. The site provides an important refuge for a range of wetland birds like the

bittern Bitterns are birds belonging to the subfamily Botaurinae of the heron family Ardeidae. Bitterns tend to be shorter-necked and more secretive than other members of the family. They were called ''hæferblæte'' in Old English; the word "bittern ...

water rail The water rail (''Rallus aquaticus'') is a bird of the rail family which breeds in well-vegetated wetlands across Europe, Asia and North Africa. Northern and eastern populations are migratory, but this species is a permanent resident in the war ...

sedge The Cyperaceae are a family of graminoid (grass-like), monocotyledonous flowering plants known as sedges. The family is large, with some 5,500 known species described in about 90 genera, the largest being the "true sedges" genus '' Carex'' ...

and

reed warbler The ''Acrocephalus'' warblers are small, insectivorous passerine birds belonging to the genus ''Acrocephalus''. Formerly in the paraphyletic Old World warbler assemblage, they are now separated as the namesake of the marsh and tree warbler famil ...

bearded tit The bearded reedling (''Panurus biarmicus'') is a small, sexually dimorphic reed-bed passerine bird. It is frequently known as the bearded tit, due to some similarities to the long-tailed tit, or the bearded parrotbill. It is the only species in ...

and

grey heron The grey heron (''Ardea cinerea'') is a long-legged wading bird of the heron family, Ardeidae, native throughout temperate Europe and Asia and also parts of Africa. It is resident in much of its range, but some populations from the more northern ...

, which can often be seen or heard there. There is a visitor centre in the bog, which is frequented by nature and

bird watching Birdwatching, or birding, is the observing of birds, either as a recreational activity or as a form of citizen science. A birdwatcher may observe by using their naked eye, by using a visual enhancement device like binoculars or a telescope, by ...

enthusiasts.

History

In previous inter-glacial periods the estuary of the River Clydach and

River Neath River Neath ( cy, Afon Nedd) is a river in south Wales running south west from the point at which its headwaters arising in the Brecon Beacons National Park converge to its mouth at Baglan Bay below Briton Ferry on the east side of Swansea Ba ...

once flowed through the valley now occupied by the wetland complex. Crymlyn Bog is an historic boundary between 'South' and 'West Wales', between the lordships of Glamorgan and Gower, and between the medieval and modern (i.e. until 1923) dioceses of St. David's and Llandaff. Part of the land was previously owned by a BP

oil refinery An oil refinery or petroleum refinery is an industrial processes, industrial process Factory, plant where petroleum (crude oil) is transformed and refining, refined into useful products such as gasoline (petrol), diesel fuel, asphalt, asphalt ...

where oil from the refinery spilt out into the wetland changing its ecology. Crymlyn Bog was largely owned by the

CEGB The Central Electricity Generating Board (CEGB) was responsible for electricity generation, transmission and bulk sales in England and Wales from 1958 until privatisation of the electricity industry in the 1990s. It was established on 1 Januar ...

who used the fen to dump waste PFA and in this same area

Swansea City Council , coa_pic = , coa_res = , coa_alt = , logo_pic = Swansea City Council Logo.svg , logo_res = , logo_alt = , house_type = Unitary authority , jurisdiction = , foundation = 1 April 1996 , preceded_by = West Glamorgan County Council S ...

used it as a landfill site. Small parts were owned by the

Neath and Tennant Canal The Neath and Tennant Canals are two independent but linked canals in South Wales that are usually regarded as a single canal. The Neath Canal was opened from Glynneath to Melincryddan, to the south of Neath, in 1795 and extended to Giant's Gra ...

Company and some sections of the

canal Canals or artificial waterways are waterways or engineered channels built for drainage management (e.g. flood control and irrigation) or for conveyancing water transport vehicles (e.g. water taxi). They carry free, calm surface fl ...

are still clear of emergent vegetation. With the surrounding industrialisation, encroaching residential districts and a polluting landfill site beside it, it was uncertain that the bog would survive. Andrew Lees, who later became Campaigns Director of

Friends of the Earth Friends of the Earth International (FoEI) is an international network of environmental organizations in 73 countries. The organization was founded in 1969 in San Francisco by David Brower, Donald Aitken and Gary Soucie after Brower's split wi ...

started a campaign with the Swansea branch of FoE to protect the bog. On an eastern limb of the bog is Pant-y-Sais fen, where there is a memorial to Mr Lees, which carries a quotation from him: "At some point I had to stand up and be counted. Who speaks for the butterflies?"

References

External links

JNCC: Crymlyn BogCountryside Council for Wales: Crymlyn BogSwansea Green Map: Crymlyn Bog and Visitor Centrewww.geograph.co.uk : photos of Crymlyn Bog and surrounding area
{{coord, 51, 38, 11.00, N, 3, 53, 18.00, W, type:mountain, display=title Bogs of Wales Wetlands of Neath Port Talbot Sites of Special Scientific Interest in West Glamorgan Nature reserves in Neath Port Talbot National nature reserves in Wales Ramsar sites in Wales