frontier Synonyms

backcountry limit limits outskirts edge perimeter borderland threshold verge border hinterland boundary dividing line outback front line Marches liminal vanguardist cutting edge boundary line limbic demarcation line marchland leading edge borderline state line bounds battlefront forefront wilds wild country far country pioneering edge unexplored territory unknown lands unmapped territory outermost region fighting front remote region borderlands bush country outlands terra incognita border line borders farthest point outer edge frontier region New Frontier outer limits