Thalweg
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
A line following the lowest part of a valley whether under water or not.
Webster.
Where a navigable river forms the boundary of coterminous states, the thalweg, or middle of the navigable channel is generally taken as the line of separation between them.
145 111. 603.
THANE (Saxon thenian, to serve). In Saxon law. A word which sometimes signifies a nobleman; at others, a freeman, a magistrate, an oflficer, or minister. A tenant of the part of the king's lands called the king's "thaneage." Termes de la Ley.