No-go area
A "no-go area" or "no-go zone" is a term used in several distinct contexts to describe a geographic area considered off-limits or too dangerous to enter. In its original military and political sense, the term refers to an area where state authorities have lost effective control, either because of official exclusion, such as a government-declared border zone or military exclusion zone, or because a violent non-state actor such as an insurgent group, terrorist organization, or criminal syndicate has established de facto control.