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The diving is spectacular featuring huge drop offs and attracting a great range of fish life, caves, pinnacles and a major feeding station starting just below the surface and dropping off into the blue are features of the Alderman Islands.

Diving the Alderman Islands MapThe Alderman Islands off the Coromandel Peninsula

The Alderman Islands are often referred to as the vanishing volcanoes. Hongiora, Ruamahua-iti, The Spire and Ruamahua-nui Islands (from West to East) are mere remnants of a once far larger volcanic complex, consisting of rhyolite domes and associated ignimbrite and breccia deposits. This group of precipitous, rocky islands was originally named The Court of Aldermen by Captain James Cook as he sailed past in 1769 and from the sea they are certainly a very imposing sight. The islands have been protected since 1933 and now constitute one of the most important wildlife sanctuaries in the region. They are administered as part of the Hauraki Gulf Maritime Park.

Coromandels other islands: From Tairua, regular trips to Shoe and Slipper Islands and the Mercury Islands just off the Coromandel coast.

AWESOME DIVING... Supporting depth, abundant marine life and one of our personal favourites, the Honeycomb Caverns!

Alderman Islands Dive-site Details

Dive Site   Profile    Viz  Temp    Notes / Restrictions 

Alderman Islands   


10-33 m (33 to 100ft)   


15-25 m (50-80ft)   


14-21°C (57-70 °F)   


Open Water Diver