Rivers means a route on any of the following waters:
(1) A river;
(2) A canal; or
(3) Such other similar waters as may be designated by a Coast Guard District Commander.
46 CFR § 114.400
Terms used in this subchapter are defined in paragraph (b) of this section. The number in parenthesis after certain terms describing areas on a vessel refers to the applicable column and row number where that area is listed in Tables 116.415 (b) and (c) of part 116 of this subchapter.