unreachable

US /ˌʌn.ˈriː.tʃ.ə.bəl/
UK /ˌʌn.ˈriː.tʃ.ə.bəl/
1.

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If a place or thing is unreachable, it is not possible to get to it, or to get hold of it:

:
The village had been unreachable because landslides had blocked the roads.