hinterland

Short definition from Wiktionary

Noun

1. 1
   The land immediately next to, and inland from, a coast.
2. 2
   The rural territory surrounding an urban area, especially a port.
3. 3
   A remote or undeveloped area.
4. 4
   That which is unknown or unexplored about someone.
5. 5
   An area of land far from the sea.
6. 6
   Anything vague or ill-defined, especially something that is ill understood.