A place covered with water too shallow for navigation with vessels ordinarilyused for commercial purposes. The space between high and low water mark along theedge of an arm of the sea , bay, tidal river, etc. Thomas v. Hatch, 23 Fed. Cas. 040;Church v. Meeker, 34 Conn. 421; Jones v. Janney, 8 Watts & S. (Pa.) 443, 42 Am. Dec.30!).