The former reach the coastal plain over long and gradual descents, and are navigable for considerable distances.
The state lies wholly within the three leading topographical regions of the eastern portion of the United States: the Coastal Plain Region, which occupies approximately the eastern half, the Piedmont Plateau Region, which occupies about 20,000 sq.
In the S.E., where the low, flat Coastal Plain is poorly drained, is the Great Dismal Swamp, a fresh-water marsh covering 700 sq.
The species of fauna that are at all characteristic of this part of the United States are found in the Piedmont Plateau Region and the western portion of the Coastal Plain Region.
Other characteristic plants of the Coastal Plain are the cranberry, wild rice, wild yam, wax myrtle, wistaria, trumpet flower, passion flower, holly and white alder.
Shore, leaving various flanking spurs and foothills, and a coastal plain which at its greatest breadth on the S.
The head of the coastal plain embayment is near the junction of the Ohio and the Mississippi.
The southern and narrow part of the table-land, called the Edwards Plateau, is more dissected thanthe rest, and falls off to the south in a frayed-out fault scarp, as already mentioned, overlooking the coastal plain of the Rio Grande embayment.
Marshy soils are found along the lowest portions of the Coastal Plain, and are exceedingly productive wherever reclaimed by draining, as in portions of the Dismal Swamp. Other portions of the Coastal Plain afford more valuable soils, sandy loams overlying sandy clays.
In the Coastal Plain region the temperature is quite stable from day to day, as a result of the equalizing effect of the numerous bays which indent this province.