An arm of the Gulf of Mexico bordering on southeast Louisiana, southern Mississippi, southwest Alabama, and a chain of small offshore islands. It is part of the Intracoastal Waterway.

• 密海西西比湾：墨西哥湾的内海，其海岸线在路易斯安那东南部、密西西比南部和阿拉巴马西南部，并有一条邻海小岛链。是近岸内航道的一部分