Southwest Pass is a narrow strait in Vermilion Parish in southern Louisiana in the United States. It connects the Gulf of Mexico to its south with Vermilion Bay to its north.[1] It is bounded on the east by Marsh Island (in Iberia Parish) and on the west by the Louisiana mainland in southeastern Vermilion Parish.[2]
Southwest Pass should not be confused with a channel in the Mississippi River Delta at the mouth of the Mississippi River also known as Southwest Pass.