On December 19, 2023, the U.S. Department of State announced the geographic coordinates defining the outer limits of the U.S. continental shelf in areas beyond 200 nautical miles from the coast. For convenience, the United States—and also this Essay—refers to the portion of a country's continental shelf that is beyond 200 nautical miles from the coast as the “extended continental shelf,” or ECS. The announcement states that the United States has ECS in seven different regions which collectively amounts to approximately a million square kilometers (about 380,000 square miles).

中文翻译：

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200海里以外的大陆架：美国外部界限的公布

2023年12月19日，美国国务院公布了定义美国大陆架外部界限（距海岸200海里以外区域）的地理坐标。为方便起见，美国以及本文将一国距海岸 200 海里以外的大陆架部分称为“扩展大陆架”或 ECS。该公告称，美国在七个不同地区拥有 ECS，总面积约为 100 万平方公里（约 380,000 平方英里）。