Valley (noun)

1. A low area of land between hills or mountains, typically with a river or stream running through it.
2. A low point or depression between two peaks or ridges.

Origin:

Middle english: from old french vallee, from latin vallis. the original sense was "a vineyard", later "an area of land between hills".

Examples:

1. The valley was surrounded by tall mountains.
2. The sun had set and the valley was plunged into darkness.
3. We hiked down into the valley.
4. The river runs through the valley.
5. The valley was filled with the sounds of birds singing.