Mississippi River Delta Is in Louisiana, Not Mississippi

The Mississippi River Delta begins south of Vicksburg, Mississippi, but the actual deltaic plain—where the river splits into distributaries (Bird's Foot Delta) and deposits sediment into the Gulf of Mexico—lies entirely within Louisiana.

The state of Mississippi borders the river but does not contain the delta. The delta's wetlands, marshes, and barrier islands are critical for storm surge protection, fisheries, and migratory birds, but they face severe loss from subsidence, sea-level rise, and sediment starvation due to upstream dams and levees.

Understanding this geography is essential for coastal restoration planning, which focuses on Louisiana's parishes (Plaquemines, Terrebonne, Lafourche, etc.).