Unfamiliar territory - Idioms by The Free Dictionary
an area of knowledge unknown to the speaker. We are in unfamiliar territory and I don't know the answer. Astronomy is unfamiliar territory for me, and I cannot answer any questions about the stars.
References in periodicals archive
Liberal Democrat defence spokesman Menzies Campbell, added: "This tragedy serves to underline that peacekeeping missions in unfamiliar territory
are often dangerous and unpredictable.
Requiem might read like any other psychological thriller - BUT WEAVING IN SUPERNATURAL UNDERTONES LEADS IT INTO UNFAMILIAR TERRITORY
, SAY ITS CAST MEMBERS.