What words is a synonym for frontier?

Here are some synonyms for "frontier," depending on the context you're using it in:

General Synonyms:

* Border

* Boundary

* Edge

* Outskirts

* Margin

* Perimeter

* Rim

* Fringe

* Limit

* Threshold

Synonyms Emphasizing Wildness and Unsettlement:

* Wilderness

* Backwoods

* Wilds

* Hinterland

* Uncharted territory

* Terra incognita

Synonyms Emphasizing Exploration and Expansion:

* Outpost

* Pioneerland

* Expansion zone

* New territory

More Specific Synonyms:

* Borderland: A region along a border, often characterized by cultural mixing.

* Frontier town: A town located on or near a frontier.

* Frontier spirit: A spirit of adventure, self-reliance, and exploration.

The best synonym for "frontier" will depend on the specific context in which you are using it.