What is Anchorage?

Legal Definition
Merc. law. A toll paid for every anchor cast from a ship into a river, and sometimes a toll bearing this name is paid, although there be no anchor cast. This toll is said to be incident to almost every port. 1 Wm. Bl. 413; 2 Chit. Com. Law, 16.
-- Bouviers Law Dictionary
Legal Definition
In English law. A prestation or toll for every anchor cast from a ship in a port; and sometimes, though there be no anchor. Hale, de Jure Mae, pt. 2, c. 6. See 1 W. Bl. 413 et seq.; 4 Term. 262.
-- Black's Law Dictionary
Legal Definition
A toll paid for casting ship’s anchor in port.
-- Ballentine's Law Dictionary