A deep recess hollow, or nook in a cliff or steep mountainside, or a small, straight valley extending into a mountain or down a mountainside.
(Source: BJGEO / WHIT)
A valley or portion of lowland that penetrates into a plateau or mountain front.
(Source: BJGEO / WHIT)
small or narrow cave in the side of a cliff or mountain
a small arm off of a larger body of water (often between rocky headlands)