Kingman Reef

Kingman Reef is a largely submerged, triangle-shaped atoll located in the North Pacific Ocean.

It sits roughly halfway between the Hawaiian Islands and American Samoa. Geologically, it is an atoll, which is a ring-shaped coral reef. The reef encloses a lagoon that reaches deep into its eastern part. It is an unincorporated territory of the United States. The reef is currently managed as the Kingman Reef National Wildlife Refuge.

This status helps protect its unique environment.

The physical structure of the reef is quite small in terms of dry land. The total area of the reef is 3 hectares, which is about 0.03 square kilometers. There are only two small strips, or spits, of dry land on the eastern rim. These spits consist of coral rubble and giant clamshells. One spit is on the northeast side of the lagoon. The other spit is twice as long but thinner on the south side. The highest point on the reef is less than one meter above sea level. Because it is often wet or awash, the reef is considered a maritime hazard.

Marine life at Kingman Reef is incredibly diverse and complex. The reef supports approximately 130 species of stony corals. This is more than three times the species diversity found in the main Hawaiian Islands.

The ecosystem is unique because it is primarily predator-based. This means there is a high level of competition for food and nutrients. Apex predators, which are animals at the very top of the food chain, make up 85% of the total fish biomass. Sharks are a major part of this group, comprising 74% of the top predator biomass.

Other carnivores like jacks also play a large role. Even threatened green sea turtles visit the reef to forage and bask on the coral rubble.

The history of the reef involves many different names and explorers. American captain Edmund Fanning discovered it on June 14, 1798. Captain W. E. Kingman later described it in 1853, and the reef now bears his name. In the 19th century, it was known as Hazard Rocks because it was dangerous for ships. The British steamship Tarta struck the reef in June 1874. The United States Guano Company claimed the area in 1859 under the U.S. Guano Islands Act. They originally called it "Dangers Rock." However, there is no evidence that guano was ever actually mined there.

In the 20th century, the reef saw more direct human activity. On May 10, 1922, Lorrin A. Thurston raised the American flag to formally claim the reef. In 1934, the U.S. Navy assumed jurisdiction over the area. During the 1930s, Pan American Airways used the lagoon as a stopover for flying boats. These planes traveled between the U.S. and New Zealand. A supply ship named the North Wind provided fuel and meals for the crews. On March 23, 1937, the Samoan Clipper became the first plane to land in the lagoon.

This era ended after a tragic accident in 1938 when a plane exploded during takeoff.

Today, the reef is a highly protected marine environment. In 2001, it was officially created as a National Wildlife Refuge. In 2009, it was upgraded to a marine national monument. This designation helps preserve the hundreds of fish and coral species. The reef is now part of the Pacific Islands Heritage Marine National Monument. It is closed to the public to ensure the ecosystem remains undisturbed.

This protection is vital because the reef has no natural resources for economic activity. It exists primarily as a sanctuary for marine biodiversity.

Despite its isolation, humans still interact with the reef in small ways. Amateur radio operators sometimes conduct DX-peditions to the site. These are trips where operators set up temporary stations to communicate with people worldwide. In October 2000, a group made over 80,000 individual radio contacts in just ten days. This shows that even a remote, submerged reef can connect to the global community. The reef remains a significant site for studying ocean health and predator-based ecosystems.