no-go area

British  

noun

1. a district in a town that is barricaded off, usually by a paramilitary organization, within which the police, army, etc, can only enter by force

2. an area that is barred to certain individuals, groups, etc

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Example Sentences

Tell her, “My relationship with my son and our finances is a no-go area. It is a pleasure to be able to help him.”

From MarketWatch

At the time, one of the families told BBC News NI: “Even when we were looking for accommodation, no-one told us that this was a no-go area.”

From BBC

And in 2017 she was accused of staging a visit to a so-called "no-go area for women" in Paris.

From BBC

Community leader Oriyomi Akeem said Slum Party has helped bring peace to a neighbourhood once known as a no-go area overrun by gangs.

From Reuters

Decades of hoarding made house 'a no-go area'

From BBC