Galveston Bay is the second-busiest port in the nation by overall tonnage. Other major ports utilizing the bay include the Port of Texas City and the Port of Galveston. With its diverse marine life, Galveston Bay also produces more seafood than any bay in the nation except the Chesapeake. The Gulf Coast gained its present configuration during the most recent glacial period approximately 18 ka (thousands of years ago). Low global sea levels allowed the Texas mainland to extend significantly further south than it is presently, and the Trinity River had carved a deep canyon through present-day Bolivar Roads on its way
Galveston, Texas 3005 (locally called Seawall Boulevard) connects Galveston to Brazoria County via the San Luis Pass-Vacek Toll Bridge. State Highway 87, known locally as Broadway Street, connects the island to the Bolivar Peninsula via the Bolivar Ferry. A project to construct the proposed Bolivar Bridge to link Galveston to Bolivar Peninsula was cancelled in 2007. Island Transit, which operates the Galveston Island Trolley manages the city's public transportation services. Intercity bus service to Galveston was previously operated by Kerrville Bus Company; following the company's acquisition by Coach USA, service was operated by Megabus. All regular intercity Bus Service is now handled