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The United States Just Grew By 1 Million Square Kilometers In Size

“America is larger than it was yesterday."

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Tom Hale

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Tom Hale

Senior Journalist

Tom is a writer in London with a Master's degree in Journalism whose editorial work covers anything from health and the environment to technology and archaeology.

Senior Journalist

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The complex rugged nature of the continental margin off the coast of Los Angeles pictured thanks to bathymetric data.

The complex rugged nature of the continental shelf off the coast of Los Angeles pictured thanks to bathymetric data.

Image credit: USGS Pacific Sea-Floor Mapping Project

Just a few weeks ago, the United States grew in size by 1 million square kilometers (more than 386,000 square miles) – that’s almost twice the area of Spain. The unexpected growth spurt was not the result of strange geological forces, nor the invasion of a foreign land, but the States attempting to lay claim to its surrounding ocean-floor territory.

Continental shelves are an area of seabed that surrounds large landmasses where the sea is relatively shallow compared with the open ocean. Under international law, countries can claim these continental shelves, allowing them to manage and exploit its resources.

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As many as 75 countries have defined their Extended Continental Shelf (ECS) limits, which refers to the portion of the continental shelf beyond 200 nautical miles (230 miles) from the coast. Until now, the US has not done this. 

On December 19, 2023, the US State Department announced new geographic coordinates defining what they claim to be their ECS area.

Since 2003, US authorities have been collaborating with the NOAA, the US Geological Survey, and 12 other agencies to gather geological data to define the outer limits of their ECS. 

In light of this work, the US now claims ECS in seven offshore areas: the Arctic, Atlantic (east coast), Bering Sea, Pacific (west coast), Mariana Islands, and two areas in the Gulf of Mexico. In total, this consumes an area that's 1 million square kilometers (more than 386,000 square miles) in size.

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“America is larger than it was yesterday,” Mead Treadwell, a former Alaska lieutenant governor and former chair of the U.S. Arctic Research Commission, said on December 19, reports Alaska Public Media.

A map showing the US Extended Continental Shelf (ECS).
A map showing the US Extended Continental Shelf (ECS).
Image credit: US State Department



“It’s not quite the Louisiana Purchase. It’s not quite the purchase of Alaska, but the new area of land and subsurface resources under the land controlled by the United States is two Californias larger,” he added.

The legality of all this is a bit hazy, Treadwell explains in a post for the Wilson Center. To make the definition official, the US has to submit data and reports to the United Nations Convention on Law of the Sea (UNCLOS). However, the US has not ratified UNCLOS due to complex political disagreements (the agreement has been ratified by 168 states and the European Union).

This leaves some uncertainty around how the proposition will be accepted under international law. 

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“If somebody came back and said, ‘Your science is bad,’ I think the United States would listen,” Treadwell told the media. “But I don’t think science is bad. I think we’ve had very good science.”

Needless to say, claiming new maritime borders can prove controversial on the international stage. Some of the most significant geopolitical spats in recent times have involved China and its neighbors, like the Philippines and Vietnam, over claims to the South China Sea.

However, the US stands to gain a lot from their recent declaration. The expansion of ocean floor territory in the Arctic Ocean could open up the area for further mining, shipping, and fishing – despite the potential damage it could spark.

It also has implications for the nation’s security and its exercise of power in the world. As Sir Walter Raleigh wrote in the 17th century: “For whosoever commands the sea, commands the trade; whosoever commands the trade of the world, commands the riches of the world, and consequently the world itself.” 


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natureNaturenatureplanet earth
  • tag
  • Arctic,

  • NOAA,

  • USA,

  • planet earth,

  • continental shelf,

  • geopolitics

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