The Poor Knights Islands Marine Reserve once described by Jacques Cousteau as one of the top 10 dive sites in the world, lies off the coast of Northland, washed by warm currents swept South from the Coral Sea It is one of New Zealand's 31 Marine Reserves.. UNESCO is currently deliberating on making it a World Heritage Site. .Pictured :The hydromedusa, Aequorea forskalea at Blue Mao Mao Arch.