no-go area

noun
1
an area, especially in a city, which is dangerous for people to enter, or that the police or army do not enter, often because it is controlled by a violent group
منطقه خطرناک, منطقه ممنوعه, منطقه ناامن, منطقه پرخطر, منطقه تحت کنترل غیرقانونی