Rivers Flowing into the Gulf of Mexico

Major Rivers Discharging into the Gulf of Mexico

The Gulf receives flow from a massive drainage basin covering much of the central U.S. and Mexico. Principal rivers:

• Mississippi River (largest by far, ~16,800 m³/s avg)
• Rio Grande / Río Bravo (US–Mexico border)
• Mobile River (Alabama, via Tombigbee/Alabama system)
• Apalachicola River (Florida, via Chattahoochee/Flint)
• Pearl River (MS/LA border)
• Sabine River (TX/LA border)
• Calcasieu River (Louisiana)
• Brazos River (Texas)
• Colorado River (Texas)
• Guadalupe River (Texas)
• Nueces River (Texas)
• Trinity River (Texas)
• San Antonio River (Texas)
• Numerous Mexican rivers (e.g., Soto la Marina, Pánuco, Coatzacoalcos)

The Mississippi dominates, contributing ~90% of total freshwater inflow.