33 CFR § 328.4 - Limits of jurisdiction.
(a) Territorial Seas. The limit of jurisdiction in the territorial seas is measured from the baseline in a seaward direction a distance of three nautical miles. (See 33 CFR 329.12)
(b) Tidal waters of the United States. The landward limits of jurisdiction in tidal waters:
(1) Extends to the high tide line, or
(2) When adjacent non-tidal waters of the United States are present, the jurisdiction extends to the limits identified in paragraph (c) of this section.
(c) Non-tidal waters of the United States. The limits of jurisdiction in non-tidal waters:
(3) When the water of the United States consists only of wetlands the jurisdiction extends to the limit of the wetland.