Although this exact mechanism of the lake-to-bay change is unknown, the main theory would be that sea-level rise after the last ice age, along with the construction of a giant sinkhole close to the bay's current mouth, formed a link between the lake and the gulf. Before then, it was a vast freshwater lake, presumably supplied by natural springs from the Floridan Aquifer. Tampa Bay originated some 6,000 years ago as a brackish drowned river valley type estuary with a broad outlet linking it to the Gulf of Mexico. Geography And Climate Of Tampa Bay Map showing the location of the Tampa Bay. Many minor rivers and streams also feed into Tampa Bay, creating a wide watershed area. The Hillsborough River, which runs into Hillsborough Bay near downtown Tampa, is the bay's greatest freshwater inflow. Tampa Bay is a massive natural harbor and shallow estuary on Florida's west-central coast that includes Hillsborough Bay, McKay Bay, Old Tampa Bay, Middle Tampa Bay, and Lower Tampa Bay.
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