Long and Kokomohua Islands are nestled inside the entrance to Queen Charlotte Sound. They are attached to each other by a largely submerged reef, which surrounds and extends northeast from Kokomohua Island for almost 500 m.
Northeast of Kokomoua Island several rocky pinnacles rise to just below the surface from relatively deep water. Here you can see schools of fish such as butterfly perch and tarakihi, and the occasional rock lobster.
The area covered by the marine reserve has been monitored almost continuously since March 1992, one year before it was established. Large blue cod are abundant in the reserve and show little fear of divers, frequently biting fingers and anything else that catches their eye.
Hector's dolphin are often seen in Queen Charlotte Sound