Wharfage is a port duty. It includes both the space allocated on a warm for loading/unloading/storing cargo and the charge levied by the dock owner for space and handling the cargo. The charge is usually included in the base freight rate or the Terminal Handling Charge.
To define, it refers to the fee charged by the freight terminal on the passage of cargo or merchandise through it. Certain charges that are not included are inspecting, loading, unloading, demurrage, sorting, weighing, marking, sampling, or any other charge by a state or central government.