edge, verge, limit; see boundary.
hinterland, remote districts, outskirts; see country 1.
"frontier." YourDictionary, n.d. Web. 18 October 2018. <http://thesaurus.yourdictionary.com/FRONTIER>.
frontier. (n.d.). Retrieved October 18th, 2018, from http://thesaurus.yourdictionary.com/FRONTIER
The line or area separating geopolitical units:
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