Foveaux Strait measures barely 30 kilometres across, yet it divides two worlds. On one side sits Bluff, a working port settled by Europeans in the 1820s, still sending dredges out for oysters each winter. On the other lies Rakiura, New Zealand's third-largest island, where roughly 400 residents share some 1,680 square kilometres of granite, peat and rimu forest with an estimated 13,000 southern brown kiwi. The Bluff to Stewart Island Ferry runs between them. The strait itself explains the route's reputation. Shallow, exposed and open to the Southern Ocean, Foveaux has been tested for two centuries by sealing schooners, muttonbirding boats and the Bluff oyster fleet. Māori navigators crossed it long before, travelling to the Tītī Islands for the annual harvest, and the tradition continues under customary right. Modern catamarans compress the passage into roughly an hour. Even so, a Foveaux Strait crossing rarely goes unnoticed by anyone aboard; the swell has no shelf to break on. What waits on the far shore accounts for the traffic. Rakiura National Park, gazetted in 2002, covers about 85 percent of the island, and Oban, on Halfmoon Bay, serves as its only real gateway. Predator-free Ulva Island lies a short water-taxi ride further on, where saddleback, rifleman and South Island robin treat visitors as scenery rather than threat. Rakiura is also among the few settled places in New Zealand where the aurora australis appears with any regularity; the Māori name is generally translated as glowing skies. Bluff to Stewart Island Ferry tours therefore carry an unusual mix — trampers bound for the multi-day North West Circuit, birders with scopes, and visitors booked on a single night's kiwi walk. Little of this is monumental in the conventional sense. There is no cathedral, no ruin, no observation deck. The architecture is a breakwater, a wharf and a shelter shed; the collection is the strait's seabirds — sooty shearwaters in their millions, mollymawks, the occasional Fiordland crested penguin. Passage remains the point, and the Rakiura ferry crossing is the whole of it. Bluff to Stewart Island Ferry tickets buy something older and narrower than sightseeing: the only scheduled surface link, aircraft aside, between the mainland and the last inhabited land before the Southern Ocean opens out toward the ice.