Mouth
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
By statute in some states, the mouth of a river or creek, which empties into another river or creek, is defined as the point where the middle of the channel of each intersects the other.
Pol. Code Cal. 1903, § 3908; Rev. St. Ariz. 1901, par. 931.