border, outpost, borderland, frontiersmen, plains, lawless, badlands, karakoram range, deserts, territory, wilds, boundary, terra incognita, pioneers, explorers, steppes, balkan peninsula, thar desert, overland, heartland, vanguard, valley, fertile crescent, yarkand, hinterland, crossroads, scrublands, marco polo sheep, agrarianism, nomads, empty quarter, stronghold, pamirs, enclave, civilization, frontera, dmz, arid, transylvanian alps, porus, boomtown, wilderness, coastlands, khiva, bastion, southern, carpathian mountains, cowboys, hotbed, battleground, bactria, northern, bridgehead, freebooting, western, semidesert, westward, zagros mountains, outlaws, foodways, redoubt, gateway, arabian desert, cavalrymen, explorations, vistas, battlefield, prospectors, demilitarized zone, hindu kush mountains, realm, interstellar space, sahara desert, outback, meriwether lewis, skirmishers, highlands, horseback, nullarbor plain, heliopause, rubicon, tableland, crossing, backwater, jungles, medievalism, modernity, yenan, prairies, chari river, ussuri, northwestern, eastern, delawares, lebensraum, hamlet, birthplace, khyber pass, caucasus mountains, snowy mountains, rugged individualism, conquistadores, frontiers, province, embassy, outposts, attache, borderlands, railways, seacoast, army, possessions, protectorate, ambassador, consulates, empire, legation, provinces, aboriginal, african, canadian, hausa, indian, maritime, sudanese, yemeni, zambian, danubian, laotian, nigerian, oromo, paraguayan, urban, urbanized, agrarian, ametican, arab, balkan

antonine wall, backwoodsman, cather, checkpoint, cooper, crudeness, delimited, desperado, desperate criminal, exposed, farthest, frederick jackson turner, frontiersman, frontierswoman, frontier settlement, hickock, inviolable, james butler hickock, james fenimore cooper, justinian, justinian i, justinian the great, marcus whitman, margrave, mountain man, outpost, ranger, san angelo, texas ranger, turner, whitman, wild bill hickock, wild west, willa cather, willa sibert cather, zonal

bound, boundary, branch of knowledge, discipline, edge, field, field of study, study, subject, subject area, subject field, wild, wilderness

rural