From Longman Dictionary of Contemporary Englishvirgin territoryvirgin territorysomething new that you are experiencing for the first time → virgin
Examples from the Corpus
virgin territory• As far as Labour is concerned, this is virgin territory.• The internet is no longer virgin territory.• Working on what in effect was virgin territory for customs officers our crews produced fantastic results in the earlier days.• Helena some years earlier to map the stars of the southern hemisphere-virtually virgin territory on the landscape of the night.• I mean, this was still virgin territory, there were no tube lines running to this part of the frontier.• Of course, our rummage crews were working on more or less virgin territory, where no customs rummage crew had been before. 