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Under the Cowardin Classification riparian and riverscour communities belong here under the Palustrine System. However, this can sometimes be confusing since they are associated with rivers and hence might be considered by some to be part of the Riverine System, in which case they are closely associated with the Rocky Rubble (Boulder, Cobble) Shore type of the Riverine System. For convenience riverscour habitats are grouped under both the Palustrine and Riverine systems to avoid confusion. 

Riparian communities of Tennessee are tremendously variable. Basically, the term includes any vegetation that borders a stream and whose composition is influenced by the stream and its various processes (e.g. flooding, silt deposition). Non-riparian flood plain communities (e.g. flood plain forests or bottomland hardwood forests) are classified under forested wetlands. Riparian communities are here divided into several types, including riparian forests and woodlands, mudflats, sandbars, gravelbars, and various types of rocky bars known collectively as riverscour communities. Riverscour communities are riparian communities developed in entrenched rocky gorges in dissected terrain where streams drop in elevation and often cut through the various rock strata. In these areas flooding is very intense and "scours" the rocky riparian zone, hence the name riverscour. Riverscour communities develop on sand, gravel, cobble, boulder, and bedrock or often on some combination of these. 

MISSISSIPPI VALLEY LOESS PLAINS

BLUFF HILLS ECOREGION

LOESS PLAIN ECOREGION

SOUTHEASTERN PLAINS

NORTHERN HILLY GULF COASTAL PLAIN ECOREGION
  • Northern Hilly Gulf Coastal Plain Unconsolidated Sand Cliff

INTERIOR PLATEAUS

WESTERN HIGHLAND RIM ECOREGION

PENNYROYAL PLAIN ECOREGION

NASHVILLE BASIN ECOREGION

CUMBERLAND ENCLAVE ECOREGION

  • Cumberland Enclave Limestone Cliff
  • Cumberland Enclave Shaley-Limestone Cliff
EASTERN HIGHLAND RIM ECOREGION

SOUTHWESTERN APPALACHIANS

CUMBERLAND PLATEAU ESCARPMENT ECOREGION

CUMBERLAND PLATEAU ECOREGION

CRAB ORCHARD MOUNTAINS

SEQUATCHIE VALLEY ECOREGION

CENTRAL APPALACHIANS

CUMBERLAND MOUNTAINS

CUMBERLAND MOUNTAIN THRUSTBLOCK ECOREGION

RIDGE AND VALLEY

SOUTHERN CALCAREOUS VALLEYS ECOREGION

SHALE VALLEYS ECOREGION

DISSECTED RIDGES ECOREGION

SANDSTONE RIDGES ECOREGION

BLUE RIDGE MOUNTAINS 

SEDIMENTARY MOUNTAINS ECOREGION

METASEDIMENTARY MOUNTAINS ECOREGION

IGNEOUS MOUNTAINS ECOREGION

AMPHIBOLITE MOUNTAINS ECOREGION

DOLOMITE COVES ECOREGION