未み知ちの領りょう域いき

expression, noun

uncharted territory; unknown waters; unfamiliar terrain

Used both literally for unexplored physical areas and figuratively for new fields, experiences, or situations where one lacks knowledge.

• この研けん究きゅうはまだ未み知ちの領りょう域いきだ。

  This research is still uncharted territory.

• 彼かれにとって海かい外がいでの生せい活かつは未み知ちの領りょう域いきだった。

  Living abroad was unfamiliar terrain for him.