The Mississippi River is the main. Major rivers in the state of Mississippi include the Big Black, Pearl, Yazoo, Pascagoula, and the Tombigbee River. Major lakes are Ross Barnett Reservoir, Arkabutla Lake, Sardis Lake, Grenada Lake, and Sardis Lake – the largest of all lakes.
The state mostly features lowlands. The highest point in Mississippi is Woodall Mountain at 807 feet (246 meters) above sea level in the foothills of the Cumberland Mountains. The lowest point in the state is sea level at the Gulf coast. The state’s mean elevation is 300 feet (91 m). The northwest portion of the state features the Mississippi Delta, a sub-region of the Mississippi Alluvial Plain.
The coastal plain is generally composed of low hills, such as the Pine Hills in the south and the North Central Hills. The Pontotoc Ridge and the Fall Line Hills in the northeast have somewhat higher elevations. The coastline includes large bays at Bay St. Louis, Biloxi, and Pascagoula. The coast is separated from the Gulf of Mexico by the shallow Mississippi Sound, which is sheltered by Petit Bois Island, Horn Island, East & West Ship Islands, Deer Island, Round Island, and Cat Island.