free port

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A port or an area of a port in which imported goods can be held or processed free of customs duties before reexport.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a port open on equal terms to all commercial vessels
• noun an area adjoining a port where goods that are intended for reshipment can be received and stored without payment of duties