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Photo: Allie_Caulfield, CC BY 2.0 via Wikimedia Commons
This is probably the reason why you're in Manapouri in the first place – refer to the linked article for detailed information.
Doubtful Sound / Patea is a fiord in Fiordland, in the far south west of New Zealand. It is located in the same region as the smaller but more famous and accessible Milford Sound / Piopiotahi. It took second place after Milford Sound as New Zealand's most famous tourism destination.
© OpenStreetMap contributors
Manapouri Community Centre
This might seem like an innocuous hall, but it was used to film a scene in The Lord of the Rings: The Two Towers, in which Frodo, Samwise and Gollum attempt to enter the black gates of Mordor.