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French Frigate Shoals

NASA picture of the French Frigate Shoals.
Location of the French Frigate Shoals
The atoll is an important refuge for Hawaiian monk seals and Laysan albatrosses
Map of the French Frigate Shoals.

The French Frigate Shoals (Hawaiian: Kānemilohaʻi) is the largest atoll in the Northwestern Hawaiian Islands. Its name commemorates French explorer Jean-François de La Pérouse, who nearly lost two frigates when attempting to navigate the shoals. It consists of a 20-mile (32 km) long crescent-shaped reef, twelve sandbars, and the 120-foot (37 m) high La Perouse Pinnacle, the only remnant of its volcanic origins. The total land area of the islets is 61.508 acres (24.891 ha). Total coral reef area of the shoals is over 232,000 acres (94,000 ha). Tern Island, with an area of 26.014 acres (10.527 ha), has a landing strip and permanent habitations for a small number of people. It is maintained as a field station in the Hawaiian Islands National Wildlife Refuge by the United States Fish and Wildlife Service.

The French Frigate Shoals are about 487 nautical miles (902 km; 560 mi) northwest of Honolulu.


  • History 1
    • World War II 1.1
  • Geology and ecology 2
  • Islands 3
  • See also 4
  • References 5
  • External links 6


Although there is no evidence of extensive human activity or presence in the area, the earliest human visitors to French Frigate Shoals probably came from the larger Hawaiian Islands, which were settled by Polynesians between 1100 and 1300 AD.

The Hawaiian island chain lay outside the routes followed by early European explorers, and it was not until La Pérouse's near-disastrous discovery that the shoals were known to the outside world. La Pérouse, aboard the frigate Boussole, was sailing westward from Monterey en route to Macau. During the night of 6 November 1786, sailors sighted breakers directly in their path, about a thousand feet ahead. Both the Boussole and her companion vessel, the frigate Astrolabe, were immediately brought about, passing within a few hundred feet of the breakers. At daybreak, the ships returned and mapped the southeastern half of the atoll, as well as finding the rock that would later be named after La Pérouse. La Pérouse named the shoals Basse des Frégates Françaises, the "Shoal of the French Frigates".

During the late 19th century, American and European companies became interested in the possibility of mining guano in the Hawaiian Islands. U.S. Navy Lieutenant John M. Brooke, sailing on the naval schooner Fenimore Cooper, formally took possession of French Frigate Shoals for the United States on 14 January 1859, in accordance with the Guano Islands Act. In 1894, French Frigate Shoals, Kure Atoll, Midway Atoll, and Pearl and Hermes Reef were leased for 25 years by the Republic of Hawaii to the North Pacific Phosphate and Fertilizer Company; however, guano and phosphate deposits at French Frigate Shoals were found to be impractical to mine. The Republic did not formally claim possession of the shoals until 13 July 1895.

French Frigate Shoals was included among the islands acquired by the United States on 7 July 1898, when Hawaii became a United States territory. In 1909 it was made a part of the Hawaiian Islands Bird Reservation.

World War II

In March 1942, Japanese naval planners took advantage of the shoal's isolation to use its protected waters as an anchorage and refueling point for the long-range flying boats employed in their Operation K. In the aftermath of that attack, US Pacific Fleet Commander Nimitz ordered a permanent US Navy presence at the shoals.

After the Battle of Midway, the United States Navy built a Naval Air Station on Tern Island, enlarging the island sufficiently to support a 3,300-foot (1,000 m) landing strip; Tern Island now has a land area of 26.014 acres (10.527 ha). The Station's main function was as an emergency landing site for planes flying between Hawaii and Midway Atoll. French Frigate Shoals Airport comprises what remains of the original seawall, runway, and buildings.

A LORAN station was operated on East Island until 1952, and Tern Island until 1979.[1] In 1969 a tsunami devastated the islands.[1]

The United States Fish and Wildlife Service continues to maintain a permanent field station there. In 2000, the atoll became part of the Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve, which was incorporated into the Northwestern Hawaiian Islands National Monument in 2006. In 2009 the islands were evacuated during the approach of Hurricane Neki, by landing a USCG C-130 on Tern's coral airstrip.[2]

Geology and ecology

La Perouse Pinnacle

La Perouse Pinnacle, a rock outcrop in the center of the atoll, is the oldest and most remote volcanic rock in the Hawaiian chain. La Perouse Pinnacle stands 120 ft (37 m) tall and is surrounded by spectacular coral reefs. Because of its peculiar shape, the pinnacle is often mistaken for a ship from a distance.

Whale-Skate Island is a submerged island in the French Frigate Shoals. These islands suffered considerably from erosion starting in the 1960s, and by the late 1990s, Whale-Skate Island was completely washed over.

The reef system at French Frigate Shoals supports 41 species of stony corals, including several species that are not found in the main Hawaiian Island chain. More than 600 species of marine invertebrates, many of which are endemic, are found here as well.

More than 150 species of algae live among the reefs. Especially diverse algal communities are found immediately adjacent to La Perouse Pinnacle. This has led to speculation that an influx of additional nutrients – in the form of guano – is responsible for the diversity and productivity of algae in this environment. The reef waters support large numbers of fish. The masked angelfish (Genicanthus personatus), endemic to the Hawaiian Islands, is relatively common here. Most of Hawaii's honu (green sea turtles) travel to the shoals to nest. The small islets of French Frigate Shoals provide refuge to the largest surviving population of Hawaiian monk seals, the second most endangered pinniped in the world.

The islands are also an important seabird colony. 18 species of seabird, the black-footed albatross, Laysan albatross, Bonin petrel, Bulwer's petrel, wedge-tailed shearwater, Christmas shearwater, Tristram's storm-petrel, red-tailed tropicbird, masked booby, red-footed booby, brown booby, great frigatebird, spectacled tern, sooty tern, blue-gray noddy, brown noddy, black noddy and white tern nest on the islands, most of them (16) on Tern Island. Two species, the blue-gray noddy and the brown booby, nest only on La Perouse Pinnacle. The island also is the wintering ground for several species of shorebird.

A three-week research mission in October 2006 by the National Oceanic & Atmospheric Administration (NOAA) led to the discovery of 100 species never seen in the area before, including many that are totally new to science. The research findings will be used to establish what species live in the area. Further studies will also determine how well the shoals' ecosystem is being managed and the threats it faces. The French Frigate Shoals project is part of the Census of Coral Reef Ecosystems of the International Census of Marine Life.


Listing of FFS islands:[3]

Island Census-
Shark Island 1010 4294
Tern Island 1009 105276
Trig Island 1008 23298
Skate Island 1) 1007 12808
Whale Island 1) 1007 19212
Disappearing Island 1002 9800
Little Gin Island 1003 19448
Gin Island 1004 9708
Near Island 2) - 400
Bare Island 3) - 400
East Island 1005 35853
Mullet Island 4) 1006 2462
Round Island 4) 1006 3078
La Perouse Pinnacle 1011 3677

1) Whale-Skate Island, currently a double island, is also listed in the census documents together as a block, with an area of 32,020 m2. The shares of the islands are estimated (40 and 60 percent).

2) 1971 it was reported that Near Island, although recorded on maps, would be submerged at high tide.

3) Bare Island can be seen on satellite images but[4] is not listed in the Census Tract[5] A 1971 publication says Bare Island has an area of 0.1 acres (about 400 m2).[6]

4) Round and Mullet Islands in census documents found together as a block 1006, together with an area of 5540 m2. The shares are valued according to a report from 1971 (0.4 and 0.5 acres).

See also


  • French Frigate Shoals: Blocks 1002 thru 1011, Census Tract 114.98, Honolulu County, Hawaii, United States Census Bureau.
  1. ^ a b LORAN Station French Frigate Shoals
  2. ^ U.S. Coast Guard aircrew rescues 10 from French Frigate Shoals
  3. ^ French Frigate Shoals
  4. ^ # lat = 23.792563 & lon = -166.2015957 & z = 19 & l = 5 & m = b Bare in Iceland satellite image. Here, the length and width of about 25 meters and 6 are measured, or in an area of approximately 150 m2.
  5. ^ PDF bei
  6. ^ A. Binion Amerson jr.: The Natural History of French Frigate Shoals, Northwestern Hawaiian Islands. Atoll Research Bulletin No. 150, 1971, Seite 28: Bare Island ... is awash at high tide and is usually about 100 feet long, 10 feet wide, and 4 feet high. It covers an area of 0.1 acre. Wetmore (ms.) in 1923 described it as "60 yards long by 10 wide, merely a ridge of sand rising 5 feet above the water and evidently swept" by waves.

External links

  • Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve site
  • The French Frigate Shoals Web Page
  • Quick Facts on French Frigate Shoals from the PBS Ocean Adventures site
  • Tern Island: Noah's Ark of the Hawaiian Isles
  • information on little-known airfield on French Frigate Shoals, and other Abandoned & Little-Known Airfields
  • Papahānaumokuākea Marine National Monument Information Management System
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