hinterland

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

Plural hinterlands