Which peninsula contains the U.S. state of Florida?

The Florida Peninsula contains the southern and central mainland of the U.S. state of Florida.

It extends southward between the Gulf of Mexico on the west and the Atlantic Ocean on the east. The peninsula is attached to the North American mainland through northern Florida and southern Georgia. Florida's panhandle is a separate westward extension and is not part of the peninsula in the strict geographic sense.

The peninsula is mostly low and flat, with its highest natural point far below the elevations found in nearby Appalachian regions. The Florida Keys form a chain of islands extending southwest from the peninsula, but they are not part of the mainland peninsula. Miami, Tampa, Orlando, and Jacksonville are major Florida cities; Jacksonville is in the northeastern part of the state, outside the narrow southern peninsula commonly shown on maps but still within peninsular Florida's broader geographic region.