Editing Bog (section)

====Raised bog====
{{Unreferenced section|date=January 2021}}
[[File:EE-Lahemaa-Bagno Viru.jpg|thumb|right|Viru Bog in [[Lahemaa National Park]], [[Estonia]], which is rich in raised bogs]]
{{main|Raised bog}}
These develop from a lake or flat [[marsh]]y area, over either non-acidic or acidic substrates. Over centuries there is a progression from open lake, to a marsh, to a [[fen]] (or, on acidic substrates, valley bog), to a [[carr (topography)|carr]], as [[silt]] or peat accumulates within the lake. Eventually, peat builds up to a level where the land surface is too flat for ground or surface water to reach the center of the wetland. This part, therefore, becomes wholly rain-fed (ombrotrophic), and the resulting acidic conditions allow the development of bog (even if the substrate is non-acidic). The bog continues to form peat, and over time a shallow dome of bog peat develops into a raised bog. The dome is typically a few meters high in the center and is often surrounded by strips of fen or other wetland vegetation at the edges or along streamsides where groundwater can percolate into the wetland.

The various types of raised bog may be divided into:
* [[Coastal bog]]
* [[Plateau bog]]
* [[Upland bog]]
* [[Kermi bog]]
* [[String bog]]
* [[Palsa bog]]
* [[Polygonal bog]]