interior
US /ɪnˈtɪr.i.ɚ/
UK /ɪnˈtɪr.i.ɚ/

1.
2.
the part of a country that is away from the coast or borders
:
•
The expedition explored the vast interior of the continent.
•
Life in the interior can be very different from coastal areas.
the part of a country that is away from the coast or borders