A marsh along the edge of a small river
Marsh in shallow water on a lakeshore
Green Cay Wetlands, Palm Beach County, Florida

A marsh is a wetland that is dominated by herbaceous rather than woody plant species.[1] Marshes can often be found at the edges of lakes and streams, where they form a transition between the aquatic and terrestrial ecosystems. They are often dominated by grasses, rushes or reeds.[2] If woody plants are present they tend to be low-growing shrubs. This form of vegetation is what differentiates marshes from other types of wetland such as swamps, which are dominated by trees, and mires, which are wetlands that have accumulated deposits of acidic peat.[3]

Basic information

White water lilies are a typical marsh plant in European areas of deeper water.
Many kinds of birds nest in marshes; this one is a yellow-headed blackbird.

Marshes provide a habitat for many species of plants, animals, and insects that have adapted to living in flooded conditions.[1] The plants must be able to survive in wet mud with low oxygen levels. Many of these plants therefore have aerenchyma, channels within the stem that allow air to move from the leaves into the rooting zone.[1] Marsh plants also tend to have rhizomes for underground storage and reproduction. Familiar examples include cattails, sedges, papyrus and sawgrass. Aquatic animals, from fish to salamanders, are generally able to live with a low amount of oxygen in the water. Some can obtain oxygen from the air instead, while others can live indefinitely in conditions of low oxygen.[3] Marshes provide habitats for many kinds of invertebrates, fish, amphibians, waterfowl and aquatic mammals.[4] Marshes have extremely high levels of biological production, some of the highest in the world, and therefore are important in supporting fisheries.[1] Marshes also improve water quality by acting as a sink to filter pollutants and sediment from the water that flows through them. Marshes (and other wetlands) are able to absorb water during periods of heavy rainfall and slowly release it into waterways and therefore reduce the magnitude of flooding.[5] The pH in marshes tends to be neutral to alkaline, as opposed to bogs, where peat accumulates under more acid conditions.

Other Languages
العربية: هور
asturianu: Marisma
azərbaycanca: Marşlar
беларуская: Маршы
български: Блато
català: Aiguamoll
čeština: Marše
dansk: Marsk
Deutsch: Marschland
eesti: Padur
español: Marisma
Esperanto: Aluvia grundo
euskara: Padura
فارسی: مرداب
français: Marais
Frysk: Sompe
Gaeilge: Corcach
Gàidhlig: Boglach
한국어: 소택
हिन्दी: दलदल
Ido: Marsho
Bahasa Indonesia: Paya
עברית: ביצת עשב
ქართული: მარშები
Latina: Aquatica
Bahasa Melayu: Rawang
Nederlands: Moeras
Nordfriisk: Maasklun
norsk: Marskland
norsk nynorsk: Marskland
Nouormand: Mathais
Plattdüütsch: Masch
polski: Rozlewisko
português: Marisma
русский: Марши
sicilianu: Margiu
සිංහල: වගුරු
Simple English: Marsh
suomi: Marskimaa
svenska: Marskland
Türkçe: Sazlık
українська: Марші
vèneto: Pałù
Tiếng Việt: Đồng lầy
中文: 河流湿地