your both correct. Territory is the correct term however terrain can also be used as a description. simply put there both create a grammatically correct sentence.
[ You have entered the White Wolves' Terrain ]
Fantasy · 1st_Manga_KING
no. no grave, there's not going to be anything left to bury
Timothy's mind welled with grand delusions as he released the trigger and let his arrow fly.
Fantasy · Margrave
this also made me remember that he ate a phoenix heart that we have yet to see used
Phoenix heart was a skill that allowed him to return from death once every two months.
First Demonic Dragon
Fantasy · AnathaShesha