Dive-site story
Off Great Mercury Island in the Coromandel region, The Bookcase takes its name from columnar volcanic rock formations that fracture into horizontal ledges resembling book stacks. Divers navigate stepped rock shelves, kelp-covered boulder fields, and swim-throughs carved by fallen slabs. These rocky features shelter temperate fish and reef invertebrates along the exposed coast.
Columnar basalt ledges resembling stacked books
Ecklonia kelp canopy sheltering nudibranchs and triplefins
Pelagic fish passing through the outer channels in summer
Packhorse and red rock lobsters wedged into rock fissures
Location
Use the map to plan with your operator and confirm the exact entry point on the day.
Seasonality
Late summer and autumn deliver the warmest water and clearest visibility around the Coromandel outer islands.
Marine life
| Species | Likelihood | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yellowtail kingfishSeriola lalandi | Common | ||||||||||||
| Australasian snapperChrysophrys auratus | Common | ||||||||||||
| Blue maomaoScorpis violacea | Common | ||||||||||||
| Red rock lobsterJasus edwardsii | Common | ||||||||||||
| Sandager's wrasseCoris sandageri | Common |
Marine forecast
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