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.
Kangaroo Island shares a border with Fleurieu.
The context doesn't say that the two locations share a border (though I guess the one being an island would be a clue if a system knew about geography). I counted on the system to think that being next to each other in sequence might mean they were next to each other geographically and maybe that's what happened?