Palustrine wetlands include any inland wetland which lacks flowing water, contains ocean-derived salts in concentrations of less than 0.5 parts per thousand, and is non-tidal. The word palustrine comes from the Latin word palus or marsh. Wetlands within this category include inland marshes and swamps as well as bogs, fens, tundra and floodplains.
Palustrine wetlands are one of five categories of wetlands within the Cowardin classification system. The other categories are:
- Marine wetlands, exposed to the open ocean
- Estuarine wetlands, partially enclosed by land and containing a mix of fresh and salt water
- Riverine wetlands, associated with flowing water
- Lacustrine wetlands, associated with a lake or other body of fresh water