Longman Dictionary of Contemporary English
exclusion zone
noun
EXAMPLES FROM CORPUS
▪ A six-mile exclusion zone was ordered around the ship while a tug towed the casualty further offshore.
▪ Dozens of towns and villages were abandoned as 135,000 people and 35,000 cattle left the exclusion zone.
▪ In thirty minutes he substantially re-established his parliamentary position and announced a 200-mile naval exclusion zone around the Falklands.
▪ The exclusion zone approved by the Home Secretary bans any procession or convoy of vehicles in the area.
▪ The Braer was outside a ten mile exclusion zone when its engines failed.
▪ Within two hours officials had set up a five-mile exclusion zone round Burdon Farm.
Wiktionary
exclusion zone
n. A geographic area in which some sanctioning authority prohibits specific activities, see also http://en.wikipedia.org/wiki/Restricted%20Area.
Wikipedia
Exclusion zone
An exclusion zone is a zone established by a sanctioning body to prohibit specific activities in a specific geographic area. These zones are created for control of populations for safety, crowd control, or military purposes, or as a border zone, and they may be temporary or permanent.