combat zone

noun
1.
Military. an area in a theater of operations where combat forces operate, extending typically from the front line to the communications zone.
2.
Slang. an area in some cities, usually in an older midtown section, where pornography stores, striptease bars, etc., flourish, or are tolerated because of being concentrated in one district.

Origin:
1935–40

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To combat zone
Example sentences
The name of the combat zone or support area and dates of service should also be
  noted on the return envelope.
Some further suggest that he has simply spent too long in the combat zone, and
  has lost grip on reality.
What these books presume is that parenting is a science, when in fact it falls
  somewhere between an art and a combat zone.
As the chapter-size biographies reveal, three of the four photographers not
  only died in a combat zone but grew up in one.
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