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For tide, boundaries and other information you can download the MarineMate app.
Long Island, Kokomohua Islands and a charted rock to the north-east, form a chain of islands and submerged reefs. The marine reserve extends 463 metres (a quarter of a nautical mile) offshore from the charted rock and from the high water mark around the islands.
Long Island - Kokomohua Marine Reserve map (PDF, 809K)
Long Island - Kokomohua Marine Reserve GPS (GPX, 2K)