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Mercury Islands dive and marine-life context.
Boat-stop bay with sand, broken reef, and ray spotting.
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Mercury Islands dive runs are handled by local boat operators from Whitianga.
Mamona Bay is a relaxed boat-stop in the Mercury Islands with a sandy bottom, a short broken reef, and plenty of open water over the sand. It suits beginner scuba, snorkel, and a laid-back lunch break, with rays cruising through the bay and small reef life tucked into the broken structure. Plan it as an easy offshore stop that works best when the water is calm and boat traffic is light.
Conservative baseline from public research. No community dives logged yet.
Depth range, seasonality, and planning context.
Reported Depth
0m - 11m
Depth Note
The bay is shallow and the site overview puts it at around 11 m, with sandy flats and broken reef.
Best Season
summer, especially January to March
Typical Conditions
Shallow, sheltered bay conditions with calm water on good days and a mix of sand, broken reef, and ray life.
Hazards, restrictions, and access requirements.
Key Hazards
Safety Notes
Watch for boat activity in the bay and treat the reef edge as a simple beginner zone, not a deep site.
Access Restrictions
Boat access is the practical route; shore access is not the normal approach for this offshore bay.
Legal Notes
The Mercury Islands are an offshore managed group, with Great Mercury Island privately owned and access limited on most islands.
Community notes to help plan your visit.
Scuba Diving
The site is a relaxed beginner dive with sand, broken reef, and easy ray-spotting terrain.
Freediving
No dedicated freedive setup is highlighted; the bay is mainly framed as a beginner scuba and snorkel stop.
Snorkeling
The shallow sand and broken reef make it a good snorkel option on calm days.
Use the planner to scan this week, inspect today in local time, and understand how exposure shapes conditions at MAMONA BAY.
Directional shelter context for incoming swell.
Community dive logs and visit reports for this site.
No Dive Logs Yet
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Average conditions based on logged dives & visits.
Planning answers for access, conditions, timing, and site logistics.
Last Updated
Research Sources
Mercury Islands dive and marine-life context.
Mercury Islands ownership and access context.
Shallow bay, calm water, and anchorage context.
Know this site? Improve Spot Details.
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