Gamble Plantation Historic State Park, also known as the Gamble Mansion, is a Florida State Park located in Ellenton, Florida, on the Manatee River and US 301. It consists of the antebellum mansion developed by its first owner, Major Robert Gamble; a 40,000-gallon cistern to provide the household with fresh water; and 16 acres (65,000 m) of the former sugarcane plantation. At its peak, the plantation included 3,500 acres, and Gamble likely held more than 200 slaves to work the property and process the sugarcane.