(a) for waters other than the Columbia River: the body of water from the ocean to the head of tidewater that is partially enclosed by land and within which salt water is usually diluted by fresh water from the land, including all associated estuarine waters, tidelands, tidal marshes and submerged lands AND
(b) for the Columbia River: all waters from the mouth of the river up to the western edge of Puget Island, including all associated estuarine waters, tidelands, tidal marshes and submerged lands.