A lagg, also called a moat, is the very wet zone on the perimeter of

peatland A mire, peatland, or quagmire is a wetland area dominated by living peat-forming plants. Mires arise because of incomplete decomposition of organic matter, usually litter from vegetation, due to water-logging and subsequent anoxia. All types ...

or a

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 ...

where water from the adjacent upland collects and flows slowly around the main

peat Peat (), also known as turf (), is an accumulation of partially Decomposition, decayed vegetation or organic matter. It is unique to natural areas called peatlands, bogs, mires, Moorland, moors, or muskegs. The peatland ecosystem covers and ...

mass. Johnson (1985), 16.

Description

A lagg is an area of wetland, especially at the edge of

raised bog Raised bogs, also called ombrotrophic bogs, are acidic, wet habitats that are poor in mineral salts and are home to flora and fauna that can cope with such extreme conditions. Raised bogs, unlike fens, are exclusively fed by precipitation ( omb ...

s, in which water collects.Landesanstalt für Umwelt, Messungen und Naturschutz Baden-Württemberg
Feuchtgebiete und ihre Heuschreckenfauna ("Wetlands and their Grasshopper Fauna")
(retrieved 9 August 2009) It is often markedly different from the terrain either side and may consist of a morass of shrubs and murky water. In addition to water gathered from surrounding uplands, the lagg also picks up water flowing down from the domed centre of a

through small channels - soaks or water tracks - to the steeply sloping shoulder or ''rand'' of the bog. At the foot of the ''rand'', the water collects and meets the water of the surrounding area on the boundary between the peat soil and mineral soil.

References

Literature

* Johnson, Charles W. ''Bogs of the Northeast''. London: University Press of New England, 1985. . * Bogs Ecosystems {{topography-stub