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
Port of Galveston and two Royal Caribbean ships call the port home year-round, while Disney operates one ship for limited sailings. An estimated 946,000 cruise passengers will sail from the port in 2017, a ten percent increase over 2016. A 2015 economic analysis estimated that cruise passengers injected $56 million per year into the local Galveston economy, an average of $62 per passenger. There are two dedicated cruise terminals. Unlike many other ports, the cruise terminals are not used for other activities, such as conferences or corporate events. Terminal 1 was expanded and improved in 2010, as a condition of Carnival placing their