The extension of a trough or basin penetrating the land or an elevation is termed an " embayment " when wide, and a " gully " when long and narrow; and the deepest part of a depression is termed a " deep."
- Mississippi lies for the most part in the Mississippi embayment of the Gulf Coastal Plain.
The entire state is included within the Austro-riparian life zone; the higher portions fall within the Carolinian area and the lower portions, including the Gulf and the Mississippi embayment almost to the N.E.
The extension of a basin or trough stretching towards the continent is termed an embayment when relatively wide and a gully when narrow.
The special features of the Gulf Plain are the peninsular extension of the plain in Florida, the belted arrangement of relief and soils in Alabama and in Texas, and the Mississippi embayment or inland extension of the plain half-way up the course of the Mississippi river, with the Mississippi flood plain there included.
In the embayment of the coastal plain some low cuesta-like belts of hills with associated strips of lowlands suggest the features of a beltedcoastal plain; the hillybeltordissected cuesta determined by the Grand Gulf formation in western Mississippi is the most distinct.
The most striking feature of the embayment is the broad valley which the Mississippi has eroded across it.
The head of the coastal plain embayment is near the junction of the Ohio and the Mississippi.
After constriction from the Mississippi embayment to 250 m.
The second important embayment is the estuary of the Columbia river; but theoccurrence of shoals at the mouth decreases the use that might otherwise be made of the river by ocean-going vessels.