free zone

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

• noun A designated area, as of a city, where certain taxes or restrictions on business or trade do not apply.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An area within a port where goods may be temporarily stored without paying duty
• noun in combination An area that is free of some specified thing e.g. a vehicle-free zone

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

• noun an area adjoining a port where goods that are intended for reshipment can be received and stored without payment of duties