unfamiliar territory

unfamiliar territory

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.
See also: territory
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.