Gardner Pinnacles

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Gardner PinnaclesNamed after the two pinnacles of volcanic rock that are a distinctive landmark for mariners, the Gardner Pinnacles (Pūhāhonu in Hawaiian, meaning “turtle surfacing for air”) are the smallest island in the Northwestern Hawaiian Island chain. While the two islands are tiny at just 5.939 acres (2.403 ha), the surrounding reef is expansive, encompassing an area of 600,000 acres (240,000 ha/940 sq mi). The highest peak measures 170 feet (52 m).

First discovered on June 2, 1820 by the American whaler Maro commanded by Captain Joseph Allen, the Gardner Pinnacles are 588 miles (946 km) northwest of Honolulu. While the islets’ landmass is home to only one plant, the luscious sea purslane, the surrounding underwater life is much more diverse. The underwater shelves are diverse and home to the highest recorded numbers of fish species in the Northwestern Hawaiian Islands, including many species not found anywhere else in the Northwestern Hawaiian island chain.

These underwater shelves reach outward from the pinnacles and extend over 604,000 acres (2,446 square kilometers). The area is also known for its abundance of giant opihi, the endemic Hawaiian limpet. The islets’ rocky inter-tidal areas are an ideal habitat for them. Besides the large numbers of fish species, the Gardner Pinnacles also have almost twice the number of coral species than the two similar rocky neighbor islands to the south, Nihoa and Necker Island. In fact, 27 documented species of stony coral can be found there.

Despite the islands’ small size, the Gardner Pinnacles is home to numerous insects, such as spiders, moths, mites, centipedes, flies, isopods, beetles and earwings, and 19 species of seabirds, including the rare blue gray noddy.

The Gardner Pinnacles are part of the Northwestern Hawaiian Islands wildlife refuge monument. A special permit is required to visit this area. The islands are off-limits even to the military, who once made an unauthorized entrance to blow off the tip of an outcrop to build an emergency helicopter landing spot.

Photo credit: Photos courtesy of Northwestern Hawaiian Islands Multi-Agency Education Project

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