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Kingman Reef aerial view
U.S. Minor Outlying IslandUnincorporated • Uninhabited

Kingman Reef KQ

A largely submerged coral atoll in the North Pacific, nearly all of it underwater at high tide, once a Pan American Airways flying boat stopover and now one of the most pristine coral reef ecosystems on Earth.

Kingman Reef is an unincorporated, unorganized U.S. territory with no permanent population and almost no dry land. It is administered by the U.S. Fish and Wildlife Service and is closed to the public.

About Kingman Reef

Kingman Reef is unlike any other U.S. territory. It is not really an island at all — it is a submerged coral atoll in the North Pacific, roughly triangular in shape and about 40 square miles in total area, but with almost none of that above water. At high tide, only a thin crescent of coral rubble and a handful of small reef flats break the surface. The total dry land area is smaller than a city block.

What Kingman lacks in land it more than makes up for underwater. Its reef system is considered one of the most pristine coral ecosystems on Earth. Because no one has ever lived here and commercial fishing has long been prohibited, the reef supports an extraordinary abundance of sharks, fish, and coral that scientists use as a baseline for what Pacific reefs looked like before human impact.

Its brief above-water history includes a stint as a Pan American Airways flying boat stopover in the late 1930s and a World War II naval waypoint. Today it is a federally protected wildlife refuge and a closed marine reserve within the Pacific Remote Islands Marine National Monument.

Kingman Reef from the air

Aerial view of Kingman Reef — nearly all underwater

Kingman Reef lagoon

The lagoon interior where Pan Am flying boats once landed

Kingman Reef vs. a U.S. State

FeatureKingman ReefU.S. State
Permanent PopulationNoneYes
Local GovernmentNoneState government
Congressional RepresentationNoneSenators + Representatives
Voting in Federal ElectionsNo residentsYes
U.S. Constitution AppliesPartially (by statute)Fully
Administered ByFish & Wildlife ServiceElected officials
Incorporated TerritoryNoYes (as a state)
Public AccessClosed — no entryGenerally open