The Gardner Pinnacles were first discovered on June 2, 1820, by the American
whaler Maro, commanded by Captain Joseph Allen. The Gardner Pinnacles are home to the giant
opihi (
Cellana talcosa), a limpet known in
Hawaiian as the , which is not found anywhere else in the world outside the Hawaiian Islands. In 1903 the Gardner Pinnacles became a part of the Hawaiian Islands Bird Reservation. In the 21st century it is part of
Papahānaumokuākea Marine National Monument wildlife refuge. In the Hawaiian Archipelago, adjacent islands/reefs are
French Frigate Shoals to the southeast, and
Maro Reef to the northwest. ==Geology==