As is the case with the other eight U.S. states that have panhandles, the geographic meaning of the term is inexact and elastic. References to the Florida Panhandle always include the ten counties west of the Apalachicola River, a natural geographic boundary, which was the historic dividing line between the British colonies of West Florida and East Florida. These western counties also lie in the Central Time Zone (with the exception of Gulf County, which is divided between the Eastern and Central Time zones), while the rest of the state is in the Eastern Time Zone. References to the Panhandle "may" also include some or all of eleven counties immediately east of the Apalachicola known as the Big Bend region, along the curve of Apalachee Bay.