In geology, a valley (also called a vale, dale, glen or strath and near or in Appalachia, a draw) is a depression with predominant extent in one direction.
http://en.wikipedia.org/wiki/Valley

Valley Towing Systems, A leader in the towing industries for over 50 years. We produce trailer hitches, 5th wheels, gooseneck hitches, ball mounts, and trailer balls.
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Silicon Valley is the southern part of the San Francisco Bay Area in Northern California, United States. The term originally referred to the region's large number of silicon chip ...
http://en.wikipedia.org/wiki/Silicon_Valley

noun, plural -leys. 1. an elongated depression between uplands, hills, or mountains, esp. one following the course of a stream. 2. an extensive, more or less flat, and relatively ...
http://dictionary.reference.com/search?q=valley

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