# Mudflat

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Coastal wetlands where sediments have been deposited by tides or rivers

"Sand flat" redirects here. For other uses, see [Sand Flat](/source/Sand_Flat_(disambiguation)).

General sketch-map of a tidal plain, showing the typical tripartition in [supratidal](/source/Supratidal_zone), [intertidal](/source/Intertidal) and [subtidal](/source/Subtidal) zones. The most apparent character of the area is the development of tidal channels, affecting mainly the [intertidal zone](/source/Intertidal_zone). In this case, the tidal flat is protected seaward by a [beach barrier](/source/Shoal), but in many cases (low-energy [waves](/source/Water_waves) and [longshore currents](/source/Longshore_currents)) the tidal flats may directly pass into a shallow marine environment.

Aerial view of rocky tidal flats off the coast of [Roscoff](/source/Roscoff), Brittany, France

**Mudflats** or **mud flats**, also known as **tidal flats** or, in Ireland, **slob** or **slobs**,[1][2] are [coastal wetlands](/source/Coastal_wetland) that form in intertidal areas where sediments have been deposited by [tides](/source/Tide) or [rivers](/source/River). A global analysis published in 2019 suggested that tidal flat ecosystems are as extensive globally as [mangroves](/source/Mangrove), covering at least 127,921 km2 (49,391 mi2) of the [Earth](/source/Earth)'s surface.[3] They are found in sheltered areas such as [bays](/source/Bay), [bayous](/source/Bayou), [lagoons](/source/Lagoon), and [estuaries](/source/Estuary); they are also seen in [freshwater](/source/Freshwater) [lakes](/source/Lake) and [salty lakes](/source/Salt_lake) (or inland seas) alike, wherein many rivers and [creeks](/source/Stream) end. Mudflats may be viewed [geologically](/source/Geology) as exposed layers of [bay mud](/source/Bay_mud), resulting from deposition of [estuarine](/source/Estuarine) [silts](/source/Silt), [clays](/source/Clay) and aquatic animal [detritus](/source/Detritus). Most of the sediment within a mudflat is within the [intertidal zone](/source/Intertidal_zone), and thus the flat is submerged and exposed approximately twice daily.

A recent global [remote sensing](/source/Remote_sensing) analysis estimated that approximately 50% of the global extent of tidal flats occurs within eight countries ([Indonesia](/source/Indonesia), [China](/source/China), [Australia](/source/Australia), [United States](/source/United_States), [Canada](/source/Canada), [India](/source/India), [Brazil](/source/Brazil), and [Myanmar](/source/Myanmar)) and that 44% of the world's tidal flats occur within Asia (56,051 km2 or 21,641 mi2).[3] A 2022 analysis of tidal wetland losses and gains estimates that global tidal flats experienced losses of 7,000 km2 (2,700 mi2) between 1999 and 2019, which were largely offset by global gains of 6,700 km2 (2,600 mi2) over the same time period.[4]

In the past tidal flats were considered unhealthy, economically unimportant areas and were often dredged and developed into agricultural land.[5] Some mudflats can be extremely treacherous to walk on. For example, the mudflats surrounding [Anchorage, Alaska](/source/Anchorage%2C_Alaska), are made from fine glacial-silt which does not easily separate out its water, and, although seemingly solid, can quickly gel and become like [quicksand](/source/Quicksand) when disturbed by stepping on it. Four people are known to have become stuck up to their waists and drowned when the tide came in, and many others are rescued from the Anchorage mudflats each year.[6]

On the [Baltic Sea](/source/Baltic_Sea) coast of [Germany](/source/Germany) in places, mudflats are exposed not by tidal action, but by wind-action driving water away from the shallows into the sea. This kind of wind-affected mudflat is called *[Windwatt](/source/Windwatt)* in German.[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

## Ecology

Mudflats near [Oban](/source/Oban%2C_New_Zealand) on [Stewart Island](/source/Stewart_Island%2FRakiura), [New Zealand](/source/New_Zealand)

Tidal flats, along with intertidal [salt marshes](/source/Salt_marsh) and [mangrove](/source/Mangrove) forests, are important [ecosystems](/source/Ecosystem).[7] They support a large population of wildlife,[8] and are a key habitat that allows tens of millions of migratory [shorebirds](/source/Shorebirds) to migrate from breeding sites in the northern hemisphere to non-breeding areas in the southern hemisphere. They are often of vital importance to [migratory birds](/source/Migratory_bird), as well as certain species of [crabs](/source/Crab),[9] [mollusks](/source/Mollusk) and [fish](/source/Fish).[10] In the [United Kingdom](/source/United_Kingdom) mudflats have been classified as a [Biodiversity Action Plan](/source/Biodiversity_Action_Plan) priority habitat.[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

The maintenance of mudflats is important in preventing coastal erosion. However, mudflats worldwide are under threat from predicted [sea level rises](/source/Sea_level_rise), land claims for development, [dredging](/source/Dredge) due to shipping purposes, and [chemical pollution](/source/Soil_contamination).[3] In some parts of the world, such as East and South-East Asia, mudflats have been reclaimed for [aquaculture](/source/Aquaculture), [agriculture](/source/Agriculture), and industrial development. For example, around the [Yellow Sea](/source/Yellow_Sea) region of East Asia, more than 65% of mudflats present in the early 1950s had been destroyed by the late 2000s.[11][12] It is estimated that up to 16% of the world tidal flats have disappeared since the mid-1980s.[3]

Mudflat sediment deposits are focused into the [intertidal zone](/source/Intertidal_zone) which is composed of a barren zone and marshes. Within these areas are various ratios of sand and mud that make up the sedimentary layers.[13] The associated growth of coastal sediment deposits can be attributed to rates of subsidence along with rates of deposition (example: silt transported via river) and changes in sea level.[13]

Barren zones extend from the lowest portion of the intertidal zone to the marsh areas. Beginning in close proximity to the tidal bars, sand dominated layers are prominent and become increasingly muddy throughout the tidal channels. Common bedding types include laminated sand, ripple bedding, and bay mud. [Bioturbation](/source/Bioturbation) also has a strong presence in barren zones.[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

[Marshes](/source/Marshes) contain an abundance of [herbaceous plants](/source/Herbaceous_plant) while the sediment layers consist of thin sand and mud layers. [Mudcracks](/source/Mudcrack) are a common as well as wavy bedding planes.[13] Marshes are also the origins of coal/peat layers because of the abundant decaying plant life.[13] [Salt pans](/source/Salt_pan_(geology)) can be distinguished in that they contain thinly laminated layers of clayey silt. The main source of the silt comes from rivers. Dried up mud along with wind erosion forms silt dunes. When flooding, rain or tides come in, the dried sediment is then re-distributed.[13]

		- Satellite view of the [Kneiss Islands](/source/Kneiss), [Tunisia](/source/Tunisia).

		- Gulls feeding on mudflats in [Skagit Bay](/source/Skagit_Bay), [Washington](/source/Washington_(state)), United States

		- Mudflats in [Brewster, Massachusetts](/source/Brewster%2C_Massachusetts), United States, extending hundreds of yards offshore at the low tide. The line of [Wrack (seaweed)](/source/Wrack_(seaweed)) and seashells in the foreground indicates the [high-water mark](/source/Tide).

## Cultural Services

Tidal flats provide cultural services that reflect a sense of place, foster social interactions, and support well-being.[14] Intergenerational practices of tidal flat gleaning and fishing are central to tidal flat-dependent communities.[15] Hence, enabling cultural preservation and identity for the coastal communities, which are intricately linked with the tidal flats ecosystem.[16]

## Selected example areas

- [Arcachon Bay](/source/Arcachon_Bay), [France](/source/France)

- [Banc d'Arguin](/source/Banc_d'Arguin), [Mauritania](/source/Mauritania)

- [Chamiza Wetland](/source/Chamiza_Wetland), [Chile](/source/Chile)

- [Great Rann of Kutch](/source/Great_Rann_of_Kutch), [India](/source/India)

- [Belhaven](/source/Belhaven%2C_Scotland), [East Lothian](/source/East_Lothian) [Scotland](/source/Scotland), [United Kingdom](/source/United_Kingdom)

- [Bridgwater Bay](/source/Bridgwater_Bay) and [Morecambe Bay](/source/Morecambe_Bay), [United Kingdom](/source/United_Kingdom)

- [Cape Cod Bay](/source/Cape_Cod_Bay), [Massachusetts](/source/Massachusetts), United States

- [Cook Inlet](/source/Cook_Inlet), [Alaska](/source/Alaska), United States

- [Lindisfarne Island](/source/Lindisfarne), [England](/source/England), [United Kingdom](/source/United_Kingdom)

- [Minas Basin](/source/Minas_Basin), [Nova Scotia](/source/Nova_Scotia), [Canada](/source/Canada)

- [Moreton Bay](/source/Moreton_Bay), [Queensland](/source/Queensland), [Australia](/source/Australia)

- [North Slob](/source/North_Slob), [Wexford](/source/Wexford), [Ireland](/source/Republic_of_Ireland)

- [Kneiss Archipelago](/source/Kneiss), [Tunisia](/source/Tunisia)

- [Padilla Bay](/source/Padilla_Bay), [Washington](/source/Washington_(state)), United States

- [Plymouth Bay](/source/Plymouth_Bay), [Massachusetts](/source/Massachusetts), United States

- [Skagit Bay](/source/Skagit_Bay), [Washington](/source/Washington_(state)), United States

- [Snettisham](/source/Snettisham), [Norfolk](/source/Norfolk) [England](/source/England), [United Kingdom](/source/United_Kingdom)

- [Wadden Sea](/source/Wadden_Sea): [Netherlands](/source/Netherlands), [Germany](/source/Germany), [Denmark](/source/Denmark)

- West coast of [Andros Island, Bahamas](/source/Andros%2C_Bahamas)

- [Yellow Sea](/source/Yellow_Sea): [China](/source/China), [North Korea](/source/North_Korea), [South Korea](/source/South_Korea) ([Getbol](/source/Getbol%2C_Korean_Tidal_Flats))

## See also

- [Wetlands portal](https://en.wikipedia.org/wiki/Portal:Wetlands)

- [Getbol](/source/Getbol%2C_Korean_Tidal_Flats)

- [Herringbone cross beds](/source/Herringbone_cross_bed)

## References

1. **[^](#cite_ref-1)** ["Sloblands"](http://www.askaboutireland.ie/enfo/irelands-environment/county-focus/wexford/wexford-sloblands/). *www.askaboutireland.ie*.

1. **[^](#cite_ref-2)** Roche, Richard. ["Celebrating the Slobs"](https://www.irishtimes.com/news/celebrating-the-slobs-1.48177). *The Irish Times*.

1. ^ [***a***](#cite_ref-Murray_3-0) [***b***](#cite_ref-Murray_3-1) [***c***](#cite_ref-Murray_3-2) [***d***](#cite_ref-Murray_3-3) Murray, N.J.; Phinn, S.R.; DeWitt, M.; Ferrari, R.; Johnston, R.; Lyons, M.B.; Clinton, N.; Thau, D.; Fuller, R.A. (2019), "The global distribution and trajectory of tidal flats", *Nature*, **565** (7738): 222–225, [Bibcode](/source/Bibcode_(identifier)):[2019Natur.565..222M](https://ui.adsabs.harvard.edu/abs/2019Natur.565..222M), [doi](/source/Doi_(identifier)):[10.1038/s41586-018-0805-8](https://doi.org/10.1038%2Fs41586-018-0805-8), [PMID](/source/PMID_(identifier)) [30568300](https://pubmed.ncbi.nlm.nih.gov/30568300), [S2CID](/source/S2CID_(identifier)) [56481043](https://api.semanticscholar.org/CorpusID:56481043)/

1. **[^](#cite_ref-Murray_et_al._2022_4-0)** Murray, Nicholas J.; Worthington, Thomas A.; Bunting, Pete; Duce, Stephanie; Hagger, Valerie; Lovelock, Catherine E.; Lucas, Richard; Saunders, Megan I.; Sheaves, Marcus; Spalding, Mark; Waltham, Nathan J.; Lyons, Mitchell B. (13 May 2022). ["High-resolution mapping of losses and gains of Earth's tidal wetlands"](https://pure.aber.ac.uk/ws/files/50771054/abm9583_CombinedPDF_v5.pdf) (PDF). *Science*. **376** (6594): 744–749. [Bibcode](/source/Bibcode_(identifier)):[2022Sci...376..744M](https://ui.adsabs.harvard.edu/abs/2022Sci...376..744M). [doi](/source/Doi_(identifier)):[10.1126/science.abm9583](https://doi.org/10.1126%2Fscience.abm9583). [PMID](/source/PMID_(identifier)) [35549414](https://pubmed.ncbi.nlm.nih.gov/35549414). [S2CID](/source/S2CID_(identifier)) [248749118](https://api.semanticscholar.org/CorpusID:248749118).

1. **[^](#cite_ref-5)** ["Dredging Indian River Lagoon Wetlands 1920 - 1950s"](https://web.archive.org/web/20130320113810/http://www.mrcirl.org/marker/marker1701/0701.html). Archived from [the original](http://www.mrcirl.org/marker/marker1701/0701.html) on 2013-03-20. Retrieved 2011-10-28.

1. **[^](#cite_ref-6)** [Associated Press - Man dies on Alaskan Mudflat](https://apnews.com/article/alaska-mud-flats-silt-drowning-96bba1b5a8a463118e3a886ae2b01499)

1. **[^](#cite_ref-7)** ["Indian River Lagoon Species Inventory Home"](https://irlspecies.org/index.php). *irlspecies.org*.

1. **[^](#cite_ref-8)** Aldea, K. (2022). The Unvegetated Tidal Flats in Catanduanes Island, Philippines: Current and Future Trends. In T. Shinbo, S. Akama & S. Kubota (Eds.), " Interdisciplinary Studies for Integrated Coastal Zone Management in the Region along the Kuroshio: Problem-Based Approach by Kuroshio Science" (pp.76-82).[https://kochi.repo.nii.ac.jp/?action=pages_view_main&active_action=repository_view_main_item_detail&item_id=8635&item_no=1&page_id=13&block_id=21](https://kochi.repo.nii.ac.jp/?action=pages_view_main&active_action=repository_view_main_item_detail&item_id=8635&item_no=1&page_id=13&block_id=21)

1. **[^](#cite_ref-9)** Triño, A. T., & Rodriguez, E. M. (2000). Mud crab (Scylla serrata) culture in tidal flats with existing mangroves. In J. H. Primavera, M. T. Castaños, & M. B. Surtida (Eds.), *Mangrove-Friendly Aquaculture: Proceedings of the Workshop on Mangrove-Friendly Aquaculture organized by the SEAFDEC Aquaculture Department, January 11–15, 1999, Iloilo City, Philippines* (pp. 171–176). Aquaculture Department, Southeast Asian Fisheries Development Center. [https://repository.seafdec.org.ph/handle/10862/454](https://repository.seafdec.org.ph/handle/10862/454)

1. **[^](#cite_ref-10)** ["Manko - Tidal Flat, Mangrove Forest"](http://www.env.go.jp/en/nature/npr/ramsar_wetland/pamph/manko_34.pdf) (PDF).

1. **[^](#cite_ref-11)** MacKinnon, J.; Verkuil, Y.I.; Murray, N.J. (2012), [*IUCN situation analysis on East and Southeast Asian intertidal habitats, with particular reference to the Yellow Sea (including the Bohai Sea)*](http://www.iucn.org/asiancoastalwetlands/), Occasional Paper of the IUCN Species Survival Commission No. 47, Gland, Switzerland and Cambridge, UK: IUCN, p. 70, [ISBN](/source/ISBN_(identifier)) [9782831712550](https://en.wikipedia.org/wiki/Special:BookSources/9782831712550), retrieved 2014-08-01{{[citation](https://en.wikipedia.org/wiki/Template:Citation)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. **[^](#cite_ref-12)** Murray, N.J.; Clemens, R.S.; Phinn, S.R.; Possingham, H.P.; Fuller, R.A. (2014), ["Tracking the rapid loss of tidal wetlands in the Yellow Sea"](https://researchonline.jcu.edu.au/60169/1/130260.pdf) (PDF), *Frontiers in Ecology and the Environment*, **12** (5): 267–272, [doi](/source/Doi_(identifier)):[10.1890/130260](https://doi.org/10.1890%2F130260)/

1. ^ [***a***](#cite_ref-Reineck_13-0) [***b***](#cite_ref-Reineck_13-1) [***c***](#cite_ref-Reineck_13-2) [***d***](#cite_ref-Reineck_13-3) [***e***](#cite_ref-Reineck_13-4) Reineck, H. E.; Singh, I. B. (1980). *Depositional Sedimentary Environments* (2nd ed.). New York: Springer-Verlag. pp. 418–428. [ISBN](/source/ISBN_(identifier)) [0-387-10189-6](https://en.wikipedia.org/wiki/Special:BookSources/0-387-10189-6).

1. **[^](#cite_ref-14)** Aldea, K.; Tumala, Z.M. (2025). ["Tidal flats' faunal resource utilization in Catanduanes Island, Philippines: gleaning, fishing, and their associated provisioning and cultural services"](https://www.frontiersin.org/journals/sustainability/articles/10.3389/frsus.2025.1650431/full).

1. **[^](#cite_ref-15)** Aldea, K.; Tumala, Z.M. (2025). ["Tidal flats' faunal resource utilization in Catanduanes Island, Philippines: gleaning, fishing, and their associated provisioning and cultural services"](https://www.frontiersin.org/journals/sustainability/articles/10.3389/frsus.2025.1650431/full).

1. **[^](#cite_ref-16)** Aldea, K.; Tumala, Z.M. (2025). ["Tidal flats' faunal resource utilization in Catanduanes Island, Philippines: gleaning, fishing, and their associated provisioning and cultural services"](https://www.frontiersin.org/journals/sustainability/articles/10.3389/frsus.2025.1650431/full).

## External links

Wikimedia Commons has media related to [Mudflats](https://commons.wikimedia.org/wiki/Category:Mudflats).

- [Tidal Flats](https://web.archive.org/web/20110605124633/http://www.cbbep.org/projects/molliebeattie/flatlinksvaluable.htm)

- [Tidal Flats Field Sites](https://web.archive.org/web/20130718151050/http://tidalflats.org/)

- [Intertidal Change Explorer](https://intertidal.app)

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Adapted from the Wikipedia article [Mudflat](https://en.wikipedia.org/wiki/Mudflat) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Mudflat?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.