Territory
Noun and の adjective
りょういき
誰でも、前進するためには未知の領域に足を踏み入れなくてはいけない。
Everyone has to take a step into unknown territory to progress.
This is my territory. This is my region. This is my domain!
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.