The primary feature of the Gulf Coastal Plains is Wide rivers and deltas.

The Gulf Coastal Plains are characterized by wide rivers and deltas, which play a significant role in shaping the region's landscape. Rivers like the Mississippi and their expansive deltas create fertile floodplains, supporting agriculture, fisheries, and diverse ecosystems. These waterways provide vital habitats for wildlife, help sustain wetlands, and serve as key transportation routes for trade. The deltas also help in flood control by absorbing excess water during heavy rains. The presence of such wide rivers and deltas makes the Gulf Coastal Plains an ecologically rich area, contributing to the region’s economic activities like farming, fishing, and tourism.