05/25/2026
U.S. Claims 386,000 Square Miles of New Seabed Territory in Major Strategic Expansion
The United States has formally declared sovereignty rights over approximately 386,000 square miles (1 million square kilometers) of seabed beyond its existing maritime boundaries, marking one of the largest expansions of U.S. resource jurisdiction in modern history.
The newly defined Extended Continental Shelf (ECS), announced by the U.S. Department of State, covers an area nearly twice the size of California and spans seven offshore regions, including parts of the Arctic, Atlantic, Pacific, Gulf of America, and other strategically important waters.
The claim follows more than two decades of scientific research involving 40 oceanographic missions. Using advanced sonar mapping, seismic surveys, and geological analysis, U.S. scientists determined that these underwater areas are natural extensions of the American continental landmass, qualifying them for ECS status under international maritime principles.
While the announcement does not expand U.S. territorial waters or alter existing fishing rights, it grants the United States exclusive rights to explore and exploit resources located on and beneath the seabed. These resources include oil, natural gas, critical minerals, and rare earth elements considered essential for advanced technology, defense systems, and renewable energy industries.
The move comes amid growing international competition for access to deep-sea resources, particularly in the Arctic, where overlapping interests with Canada and Russia could create diplomatic challenges. Analysts view the declaration as a significant step in strengthening U.S. strategic and economic interests in an increasingly contested maritime environment.
Environmental experts, however, have cautioned that future deep-sea mining and extraction activities could pose risks to fragile ocean ecosystems that remain largely unexplored by science.
The announcement highlights the growing geopolitical importance of the ocean floor as nations race to secure access to critical resources and strengthen their long-term energy and industrial security.
Source: U.S. Department of State, Office of Ocean and Polar Affairs. Announcement of the Outer Limits of the U.S. Extended Continental Shelf (2026).
