Situated on the Atlantic coastal plain, this type is located within hummock-and-hollow microtopography characterized by short-term regular flooding of saline water from streams and estuaries that provide enough fresh water (i.e., saline <0.5 parts per thousand) to support trees and shrubs. Soils are poorly drained slightly acidic tidal muck consisting of variable amounts of silt, clay and fine sands mixed with root-rich peats. Many examples are dominated by baldcypress, or by pumpkin ash and red maple or green ash and red maple. Other associates can include blackgum, water tupelo, American elm, and black willow. In higher salinity areas (5.0 to 18.0 ppt) that are flooded irregularly and often less than daily, loblolly pine can form dominant canopy. These areas are likely to transition to tidal marshlands as sea-level continues to rise.