17.26 DEFINITION: "NAVIGABLE WATERS" refers to any body of water which is suitable for navigation by some type of vessel, such as a boat, ship, or barge. This includes both natural and artificial waterways, as well as all tributaries, streams, rivers, canals, lakes, lagoons, and harbors. The navigability of a waterway is typically determined by its depth, width, and gradient, as well as the presence of obstructions or impediments to navigation. Types of navigable waters include coastal waters, inland waters, international waters, and territorial waters.