Territorial sea baseline means the line defining the shoreward extent of the territorial sea of the United States drawn according to the principles, as recognized by the United States, of the Convention on the Territorial Sea and the Contiguous Zone, 15 U.S.T. 1606, and the 1982 United Nations Convention on the Law of the Sea (UNCLOS), 21 I.L.M. 1261. Normally, the territorial sea baseline is the mean low water line along the coast of the United States.

(a) With respect to the United States, the following apply—

(1) Territorial sea means the waters, 12 nautical miles wide, adjacent to the coast of the United States and seaward of the territorial sea baseline, for—

(i) Statutes included within subtitle II, subtitle VI, and subtitle VII, title 46, U.S.C.; the Act of June 15, 1917, as amended (46 U.S.C. 70051-70054); and the Vessel Bridge-to-Bridge Radiotelephone Act (33 U.S.C. 1201-1208), and any regulations issued under the authority of these statutes.

(ii) Purposes of criminal jurisdiction pursuant to Title 18, United States Code.

(iii) The special maritime and territorial jurisdiction as defined in 18 U.S.C. 7.

(iv) Interpreting international law.

(v) Any other treaty, statute, or regulation, or amendment thereto, interpreted by the Coast Guard as incorporating the definition of territorial sea as being 12 nautical miles wide, adjacent to the coast of the United States and seaward of the territorial sea baseline.

(2) Unless otherwise specified in paragraph (a)(1) of this section, territorial sea means the waters, 3 nautical miles wide, adjacent to the coast of the United States and seaward of the territorial sea baseline.

(3) In cases where regulations are promulgated under the authority of statutes covered by both paragraphs (a)(1) and (a)(2) of this section, the Coast Guard may use the definition of territorial sea in paragraph (a)(1) of this section.

(b) With respect to any other nation, territorial sea means the waters adjacent to its coast that have a width and baseline recognized by the United States.

(a) With respect to the United States, internal waters means the waters shoreward of the territorial sea baseline.

(b) With respect to any other nation, internal waters means the waters shoreward of its territorial sea baseline, as recognized by the United States.

Inland waters means the waters shoreward of the territorial sea baseline.

(a) For the purposes of the Federal Water Pollution Control Act (33 U.S.C. 1251 et seq.), contiguous zone means the zone, 9 nautical miles wide, adjacent to and seaward of the territorial sea, as defined in § 2.22(a)(2), that was declared to exist in Department of State Public Notice 358 of June 1, 1972 and that extends from 3 nautical miles to 12 nautical miles as measured from the territorial sea baseline.

(b) For all other purposes, contiguous zone means all waters within the area adjacent to and seaward of the territorial sea, as defined in § 2.22(a), and extending to 24 nautical miles from the territorial sea baseline, but in no case extending within the territorial sea of another nation, as declared in Presidential Proclamation 7219 of September 2, 1999 (113 Stat. 2138).

(a) With respect to the United States, including the Commonwealth of Puerto Rico, the Commonwealth of the Northern Mariana Islands, Guam, American Samoa, the United States Virgin Islands, and any other territory or possession over which the United States exercises sovereignty, exclusive economic zone means the zone seaward of and adjacent to the territorial sea, as defined in § 2.22(a), including the contiguous zone, and extending 200 nautical miles from the territorial sea baseline (except where otherwise limited by treaty or other agreement recognized by the United States) in which the United States has the sovereign rights and jurisdiction and all nations have the high seas freedoms mentioned in Presidential Proclamation 5030 of March 10, 1983.

(b) Under customary international law as reflected in Article 55 of the 1982 United Nations Convention on the Law of the Sea, and with respect to other nations, exclusive economic zone means the waters seaward of and adjacent to the territorial sea, not extending beyond 200 nautical miles from the territorial sea baseline, as recognized by the United States.

(a) For purposes of special maritime and territorial jurisdiction of the United States as defined in 18 U.S.C. 7, high seas means all waters seaward of the territorial sea baseline.

(b) For the purposes of section 2 of the Act of February 19, 1895, as amended (33 U.S.C. 151) and the Inland Navigational Rules Act of 1980 (33 U.S.C. Chapter 34), high seas means the waters seaward of any lines established under these statutes, including the lines described in part 80 of this chapter and 46 CFR part 7.

(c) For the purposes of 14 U.S.C. 522,14.S.C. 545, 33 U.S.C. 409,and.S.C. 1471 et seq., high seas includes the exclusive economic zones of the United States and other nations, as well as those waters that are seaward of territorial seas of the United States and other nations.

(d) Under customary international law as reflected in the 1982 United Nations Convention on the Law of the Sea and without prejudice to high seas freedoms that may be exercised within exclusive economic zones pursuant to article 58 of the United Nations Convention on the Law of the Sea, and unless the context clearly requires otherwise (e.g., The International Convention Relating to Intervention on the High Seas in Cases of Oil Pollution Casualties, 1969, including annexes thereto), high seas means all waters that are not the exclusive economic zone (as defined in § 2.30), territorial sea (as defined in § 2.22), or internal waters of the United States or any other nation.

(a) Waters subject to tidal influence and waters subject to the ebb and flow of the tide are waters below mean high water. These terms do not include waters above mean high water caused by flood flows, storms, high winds, seismic waves, or other non-lunar phenomena.

(b) Mean high water is the average of the height of the diurnal high water at a particular location measured over a lunar cycle of 19 years.

(a) Except as provided in paragraph (b) of this section, navigable waters of the United States, navigable waters, and territorial waters mean, except where Congress has designated them not to be navigable waters of the United States:

(1) Territorial seas of the United States;

(2) Internal waters of the United States that are subject to tidal influence; and

(3) Internal waters of the United States not subject to tidal influence that:

(i) Are or have been used, or are or have been susceptible for use, by themselves or in connection with other waters, as highways for substantial interstate or foreign commerce, notwithstanding natural or man-made obstructions that require portage, or

(ii) A governmental or non-governmental body, having expertise in waterway improvement, determines to be capable of improvement at a reasonable cost (a favorable balance between cost and need) to provide, by themselves or in connection with other waters, as highways for substantial interstate or foreign commerce.

(b) Navigable waters of the United States and navigable waters, as used in sections 311 and 312 of the Federal Water Pollution Control Act, as amended, 33 U.S.C. 1321 and 1322, mean:

(1) Navigable waters of the United States as defined in paragraph (a) of this section and all waters within the United States tributary thereto; and

(2) Other waters over which the Federal Government may exercise Constitutional authority.

Waters subject to the jurisdiction of the United States and waters over which the United States has jurisdiction mean the following waters—

(a) Navigable waters of the United States, as defined in § 2.36(a).

(b) Waters, other than those under paragraph (a) of this section, that are located on lands for which the United States has acquired title or controls and—

(1) Has accepted jurisdiction according to 40 U.S.C. 255; or

(2) Has retained concurrent or exclusive jurisdiction from the date that the State in which the lands are located entered the Union.

(c) Waters made subject to the jurisdiction of the United States by operation of the international agreements and statutes relating to the former Trust Territory of the Pacific Islands, and waters within the territories and possessions of the United States.