edge, verge, limit; see boundary.
hinterland, remote districts, outskirts; see country 1.
"frontier." YourDictionary, n.d. Web. 21 March 2019. <https://thesaurus.yourdictionary.com/frontier>.
frontier. (n.d.). Retrieved March 21st, 2019, from https://thesaurus.yourdictionary.com/frontier
The line or area separating geopolitical units:
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