Galveston Bay, Texas

Galveston Bay
Satellite image of Galveston Bay. Galveston Island is at the bottom of the image, separated from Bolivar Peninsula by Bolivar Roads. A portion of Greater Houston is visible to the left.
Location	Texas Gulf Coast
Coordinates	29°34′11″N 94°56′12″W / 29.56972°N 94.93667°W / 29.56972; -94.93667Coordinates: 29°34′11″N 94°56′12″W / 29.56972°N 94.93667°W / 29.56972; -94.93667
Primary inflows	Trinity River, San Jacinto River
Ocean/sea sources	Gulf of Mexico
Basin countries	United States
Max. length	30 miles (48 km)
Max. width	17 miles (27 km)
Surface area	600 square miles (1,600 km2)
Average depth	6 feet (1.8 m)
Max. depth	10 feet (3.0 m)
Settlements	Texas City, Kemah, Seabrook, La Porte, Baytown, Anahuac

Galveston Bay (/ˈɡælvᵻstən/ GAL-viss-tən) is the seventh-largestestuary in the United States, located along the upper coast of Texas. It is connected to the Gulf of Mexico and is surrounded by sub-tropic marshes and prairies on the mainland. The water in the bay is a complex mixture of sea water and fresh water which supports a wide variety of marine life.

The bay has played a significant role in the history of Texas. Galveston Island is home to the city of Galveston, the earliest major settlement in southeastern Texas and the state's largest city toward the end of the 19th century. While a devastating hurricane in 1900 hastened Galveston's decline, the subsequent rise of Houston as a major trade center, facilitated by the dredging of the Houston Ship Channel across the western half of the bay, ensured the bay's continued economic importance.

Today, Galveston Bay is encompassed by the Greater Houston metropolitan area, the fifth-largest in the United States with a population of over 6.6 million. The Port of Houston, which has facilities spread across the northwestern section of the 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.