Lesser known and explored, this place is more magnificent than its popular counterpart, Milford Sound. Named so after Captain Cook was “doubtful” whether the inlet was navigable or not, this landscape is been in the shadows for quite some time. Not many travellers are aware of it and thus it is a much more secluded place. It is not as accessible as the Milford Sound, but by boat it can be easily navigated. Take a boat ride from Manapouri to here and enjoy the landscape and the blue waters. You can spot a lot of wildlife here as well like seals, penguins, starfish and some colourful corals.