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 than expected pace, requiring more dredging in 2016. The western part of the port will be dredged from a dept of to , at a cost of $12-15 million. To accommodate cruise ships, the area where the ships turn around is routinely dredged every four years. During the late 19th century, the port was the busiest on the Gulf Coast and considered to be second busiest in the country, next to the port of New York City. In the 1850s, the port of Galveston exported approximately goods valued almost 20 times what was imported. The main export was cotton. The