Geomorphology

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This wetland habitat type can occur in:

• Narrow swales associated with Quaternary coastal dunes and beaches
• Fringing lakes and lagoons in coastal dune swales
• The low part of coastal landscape where water collects from both overland flow and infiltration from adjoining sand dunes
• Depressions between old sand dunes and in dune swales
• Drainage swamps in dunefields
• Fringing crater lakes
• Closed systems on sand sheets, flat landscapes because they are old sandy outwash with shallow, turbid water, on the Gulf plains
• Fringing perched and window lakes.

Soils

As coastal non-floodplain grass, sedge and herb swamps are most commonly found on sand dune systems and some clay systems, associated soils are often pale to dark humic sands or grey clay loams underlying dune systems—see soil sand, clay and organic matter for information on soil diversity and Wetland Soil Factsheets for local examples.