Tampa Bay
Tampa Bay is a large natural harbor and estuary connected to the Gulf of Mexico on the west central coast of Florida, comprising Hillsboro Bay, McKay Bay, Old Tampa Bay, Middle Tampa Bay, and Lower Tampa Bay. The surrounding area is home to about 4 million residents, making it a heavily used commercial and recreational waterway but putting much stress on the bay's ecosystem, which once teemed with enough wildlife to easily support an extensive indigenous culture. Much greater care has been taken in recent decades to mitigate the effects of human habitation on Tampa Bay, and water quality has slowly improved over time.
The term "Tampa Bay" is sometimes used as shorthand to refer to all or parts of the Tampa Bay area, which comprises many towns and cities in several counties surrounding the large body of water. Local marketing and branding efforts (including several professional sports teams, tourist boards, and chambers of commerce) commonly use the moniker "Tampa Bay", furthering the misconception that it is the name of a particular municipality when this is not the case.
Approximately 6,000 years ago, Tampa Bay formed as a brackish drowned river valley typeestuary with a wide mouth connecting it to the Gulf of Mexico. Prior to that time, it was a large fresh water lake, possibly fed by the Floridan Aquifer through natural springs. Though the exact process of the lake-to-bay transformation is not completely understood, the leading theory is that rising seas levels following the last ice age coupled with the formation of a massive sink hole near the current mouth of the bay created a connection between the lake and the gulf.
Tampa Bay is Florida's largest open-water estuary, extending over 400 square miles (1,000 km2) and forming coastlines of Hillsborough, Manatee and Pinellas counties. The freshwater sources of the bay are distributed among over a hundred small tributaries, rather than a single river. The Hillsborough River is the largest such freshwater source, with the Alafia, Manatee, and Little Manatee rivers the next largest sources. Because of these many flows into the bay, its large watershed covers portions of five Florida counties and approximately 2,200 square miles (5,700 km2). The bay bottom is silty and sandy, with an average water depth of only about 12 feet (3.7 m).
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