A remote undeveloped rural area.

Remote parts of a country.
Inland area behind coast or coastal town.
Area that is served by a port or settlement (the central place) and included in its sphere of influence. The city of Rotterdam, the Netherlands, is the hinterland of a port.

1. That which is within; the internal or inner part of a thing; the inside.
2. The inland part of a country, state, or kingdom

The chiefly northerly sections of a state; also; the chiefly rural part of a state when the major metropolitan area is in the south