Aransas Pass is a navigable salt water channel connecting the Gulf of Mexico with Aransas Bay on the Texas Gulf coast in the United States. The pass separates Mustang Island to the south from San José Island to the north, and is protected by jetties extending into the Gulf from both islands. At the eastern end of the pass is the town of Port Aransas, located at the far northern end of Mustang Island. At the western end of the pass, on the mainland side of Aransas Bay, is the town of Aransas Pass. A free ferry serves the two towns.