forbidden

adjective [原级]禁止的；禁止进入的；忌讳的，禁止做（谈论）的；禁戒的

A forbidden place is one that you are not allowed to visit or enter. ^{禁止入内的 (地方)•  This was a forbidden area for foreigners. 这是一个禁止外国人入内的地区。}