premise: Finniss is an electoral district of the House of Assembly in the Australian state of South Australia. It is named after B. T. Finniss, the first Premier of South Australia. It covers a 5,875 km² regional area which includes Kangaroo Island, the Fleurieu Peninsula, and the towns of Kingscote, Middleton, Mount Compass, Penneshaw, Port Elliot, Sellicks Beach, Victor Harbor and Yankalilla.
hypothesis: The Fleurieu in South Australia is a piece of land that is mostly surrouded by water. 
reason: the Fleurieu Peninsula is located in South Australia and the definition of a peninsula is a piece of land almost surrounded by water or projecting out into a body of water.