Noun
valley; ravine; gorge; chasm
あの人たちの小屋は谷間にある。Their hut is situated in the valley. cleavage (of breasts)
part or place that has been left behind; blind spot; bottom (of society); (economic) trough; gap (in activity, one's work, etc.); lull; opening
Also written 谷あい【たにあい】