The river that flows through the Texas Coastal Plain is the Brazos River.

The Brazos River flows through the Texas Coastal Plain and is one of the longest rivers in Texas. It stretches over 1,200 miles, providing vital water resources for agriculture, industry, and communities in the region. The river plays an important role in supporting the fertile soils of the Coastal Plains, making the area ideal for farming and livestock production. Additionally, the Brazos River contributes to local ecosystems, creating wetlands and habitats for diverse wildlife. Its historical significance and scenic beauty also make it a focal point for recreation and outdoor activities, such as fishing, boating, and wildlife watching.