Valley vs. Glen: What's the Difference?

Valley and Glen Definitions
Valley
An elongated lowland between ranges of mountains, hills, or other uplands, often having a river or stream running along the bottom.
Glen
A small, secluded valley.
Valley
An extensive area of land drained or irrigated by a river system.
Glen
A secluded and narrow valley, especially one with a river running through it; a dale; a depression between hills.
Valley
A depression or hollow resembling or suggesting a valley, as the point at which the two slopes of a roof meet.
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Glen
A secluded and narrow valley; a dale; a depression between hills.
And wooes the widow's daughter of the glen.
Valley
An elongated depression cast between hills or mountains, often garnished with a river flowing through it.
Glen
A narrow secluded valley (in the mountains)
Valley
An area which drains itself into a river.
Valley
Any structure resembling one, e.g. the interior angle formed by the intersection of two sloping roof planes.
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Valley
To form the shape of a valley.
Valley
The space inclosed between ranges of hills or mountains; the strip of land at the bottom of the depressions intersecting a country, including usually the bed of a stream, with frequently broad alluvial plains on one or both sides of the stream. Also used figuratively.
The valley of the shadow of death.
Sweet interchangeOf hill and valley, rivers, woods, and plains.
Valley
The place of meeting of two slopes of a roof, which have their plates running in different directions, and form on the plan a reëntrant angle.
Valley
A long depression in the surface of the land that usually contains a river