Territorial waters refer to coastal waters under a nation-state's sovereignty, extending up to 12 nautical miles from the baseline, as defined by the UN Convention on the Law of the Sea. Historically, disputes over their limits—ranging from 3 to 12 miles—reflected competing interests in fisheries, defense, and resource management. Thomas Wemyss Fulton supported clearly defined, limited boundaries to protect coastal economies, while legal rulings such as the U.S.
Supreme Court’s United States v. California helped clarify the jurisdiction over internal waters. China’s legal system focuses on securing territorial water baselines, and the Encyclopaedia Britannica differentiates territorial waters from the open high seas. These diverse viewpoints highlight how legal, economic, and strategic factors influence maritime sovereignty.