The Duddon Estuary is the sandy, gritty estuary of the River Duddon that lies between

Morecambe Bay Morecambe Bay is an estuary in north-west England, just to the south of the Lake District National Park. It is the largest expanse of intertidal mudflats and sand in the United Kingdom, covering a total area of . In 1974, the second largest ga ...

and the North Lonsdale coast. The River Duddon and its estuary form part of the boundary of the historic county of Lancashire. It opens into the

Irish Sea The Irish Sea is a body of water that separates the islands of Ireland and Great Britain. It is linked to the Celtic Sea in the south by St George's Channel and to the Inner Seas off the West Coast of Scotland in the north by the North Ch ...

to the north of the

Furness Furness ( ) is a peninsula and region of Cumbria, England. Together with the Cartmel Peninsula it forms North Lonsdale, Historic counties of England, historically an exclave of Lancashire. On 1 April 2023 it became part of the new unitary author ...

peninsula;

Walney Island Walney Island, also known as the Isle of Walney, is an island off the west coast of England, at the western end of Morecambe Bay in the Irish Sea. Within the boundaries of the historic county of Lancashire, it is part of Barrow-in-Furness, sepa ...

forming part of its southern edge. Its 28 miles (45 km) of shoreline enclose an area of 13 square miles (35 km²), making it the second largest estuary in Cumbria after the

Solway Firth The Solway Firth is an inlet on the west coast of Great Britain, forming part of the border between England and Scotland. The firth (a Scottish term for an inlet of the sea) divides Cumbria (including the Solway Plain) from Dumfries and Gallow ...

and one of the six main estuaries in the historic county of Lancashire. The main settlements alongside the Duddon estuary are Haverigg,

Millom Millom is a town and civil parish on the north shore of the estuary of the River Duddon in southernmost Cumberland, Cumbria, England. It is situated just outside the Lake District National Park, about north of Barrow-in-Furness ( by road) and ...

, Foxfield, Kirkby-in-Furness, Askam and Ireleth and

Barrow-in-Furness Barrow-in-Furness is a port town and civil parish (as just "Barrow") in the Westmorland and Furness district of Cumbria, England. Historic counties of England, Historically in the county of Lancashire, it was incorporated as a municipal borou ...

Biological importance

The estuary as a whole was designated as a

Site of Special Scientific Interest A Site of Special Scientific Interest (SSSI) in Great Britain, or an Area of Special Scientific Interest (ASSI) in the Isle of Man and Northern Ireland, is a conservation designation denoting a protected area in the United Kingdom and Isle ...

(SSSI) in 1990 with the amalgamation of five previously separate SSSIs: Duddon Sands, Sandscale Haws, North Walney, Hodbarrow Lagoon and Haverigg Haws. It is a

Ramsar site A Ramsar site is a wetland site designated to be of international importance under the Ramsar Convention,8 ha (O) *** Permanent 8 ha (P) *** Seasonal Intermittent < 8 ha(Ts) **

natterjack toad The natterjack toad (''Epidalea calamita'') is a toad native to sandy and heath (habitat), heathland areas of Europe and the United Kingdom. Adults are in length, and are distinguished from common toads by a yellow line down the middle of the b ...

s. It supports one fifth of the national population of the rare amphibian that is only found at 50 sites in the UK, of which five are in the Duddon Estuary.

Birds

The Duddon Estuary is an

Important Bird Area An Important Bird and Biodiversity Area (IBA) is an area identified using an internationally agreed set of criteria as being globally important for the conservation of bird populations. IBA was developed and sites are identified by BirdLife Int ...

. Species to be seen include pintail,

red knot The red knot or just knot (''Calidris canutus'') is a medium-sized shorebird which breeds in tundra and the Arctic Cordillera in the far north of Canada, Europe, and Russia. It is a large member of the ''Calidris'' sandpipers, second only to the ...

and

common redshank The common redshank or simply redshank (''Tringa totanus'') is a Eurasian wader in the large family Scolopacidae. Taxonomy The common redshank was formally described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of hi ...

with wintering waterfowl including

common shelduck The common shelduck (''Tadorna tadorna'') is a waterfowl species of the shelduck genus, ''shelduck, Tadorna''. It is widespread and common in the Euro-Siberian region of the Palearctic realm, Palearctic, mainly breeding in temperate and wintering ...

red-breasted merganser The red-breasted merganser (''Mergus serrator'') is a duck species that is native to much of the Northern Hemisphere. The red breast that gives the species its common name is only displayed by males in breeding plumage. Individuals fly rapidly ...

s, Eurasian oystercatchers,

ringed plover The common ringed plover or ringed plover (''Charadrius hiaticula'') is a species of bird in the family Charadriidae. It breeds across much of northern Eurasia, as well as Greenland. Taxonomy The common ringed plover was Species description, f ...

, dunlin and

Eurasian curlew The Eurasian curlew or common curlew (''Numenius arquata'') is a very large wader in the family Scolopacidae. It is one of the most widespread of the curlews, breeding across temperate Europe and Asia. In Europe, this species is often referred ...

. In 1998 it was designated a

Special Protection Area A special protection area (SPA) is a designation under the European Union Directive on the Conservation of Wild Birds. Under the Directive, Member States of the European Union (EU) have a duty to safeguard the habitats of migratory birds and cer ...

(SPA) under the

Birds Directive The Birds Directive (formally known as Council Directive 2009/147/EC on the conservation of wild birds) is the oldest piece of EU legislation on the environment and one of its cornerstones which was unanimously adopted in April 1979 as the Dir ...

. It qualified under three criteria: * regularly there are over 20,000 wintering waterfowl. * breeding population of sandwich terns * overwintering populations of knot, pintail and redshank; populations on passage of ringed plover and sanderling. In 2015, before the United Kingdom European Union membership referendum, there were consultations on a successful proposal that Morecambe Bay and Duddon Estuary be combined in a new SPA. This would amalgamate the existing Morecambe Bay and Duddon Estuary SPAs and would add marine areas identified as being used by foraging

tern Terns are seabirds in the family Laridae, subfamily Sterninae, that have a worldwide distribution and are normally found near the sea, rivers, or wetlands. Terns are treated in eleven genera in a subgroup of the family Laridae, which also ...

Flora

The estuary is botanically rich with

salt marsh A salt marsh, saltmarsh or salting, also known as a coastal salt marsh or a tidal marsh, is a coastal ecosystem in the upper coastal intertidal zone between land and open saltwater or brackish water that is regularly flooded by the tides. I ...

, sand dune and shingle communities, including a nationally rare shingle vegetation community at Haverigg Haws and North Walney. Shingle species include sea sandwort, spear-leaved orache, sea rocket and sea kale. All the dune grasslands at Sandscale Haws, Haverigg Haws and North Walney support a rich flora with the rare dune helleborine.

Threats

Development has had no significant effect on the nature conservation interest of the estuary, but it is at risk from coastal defence works, grazing by agricultural stock,

sea level rise The sea level has been rising from the end of the last ice age, which was around 20,000 years ago. Between 1901 and 2018, the average sea level rose by , with an increase of per year since the 1970s. This was faster than the sea level had e ...

, recreational pressure and bait digging.

References

External links

SPA designation
{{oscoor gbx, 319960_479880 Geography of Cumbria Important Bird Areas of England Ramsar sites in England Special Protection Areas in England Sites of Special Scientific Interest in Cumbria Furness Barrow-in-Furness