Cape Sable Island, locally referred to as Cape Island, is a small Canadian island at the southernmost point of the Nova Scotia peninsula. It is sometimes confused with Sable Island. Historically, the Argyle, Nova Scotia region was known as Cape Sable and encompassed a much larger area than simply the island it does today. It extended from Cape Neg…Cape Sable Island, locally referred to as Cape Island, is a small Canadian island at the southernmost point of the Nova Scotia peninsula. It is sometimes confused with Sable Island. Historically, the Argyle, Nova Scotia region was known as Cape Sable and encompassed a much larger area than simply the island it does today. It extended from Cape Negro through Chebogue.