The Coastal Plains are primarily characterized by flat, sandy soil, which defines the region's overall terrain.

This low-lying landscape extends along coastlines, often featuring wetlands, marshes, and estuaries that create diverse ecosystems. The sandy soil in Coastal Plains is typically well-drained, making it suitable for various agricultural practices. As a result, this area supports the farming of crops such as corn, soybeans, and cotton, contributing significantly to the local economies. Additionally, the flat terrain allows for easy access to the coast, fostering tourism and recreational activities like fishing and boating. The unique combination of flat, sandy soil and diverse habitats in the Coastal Plains highlights their ecological and economic importance, making them a vital region within the United States.