premise: Corsica is a mountain.
hypothesis: Corsica ( [ ˈkɔrsɪkə ] Corse [ kɔʁs ] Corsican and Italian : Corsica [ ˈkɔrsika ] ) is an island in the Mediterranean Sea and one of the 13 regions of France . A single chain of mountains makes up two-thirds of the island . Bastia , the prefecture city of Haute-Corse , is the second-largest settlement in Corsica .