Cwm Silicon (Welsh for Silicon Valley) is an epithet applied to a region of South Wales in the far west of Newport that attracted interest and inward investment from the technology sector in the early 2000s.^{[citation needed]}

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As of 2010^[update], the future of the area as an important technological centre was uncertain following the closure of its key LG factory in August 2003.^{[citation needed]} The area is next to the M4 and is a centre for high-technology companies, like much of the M4 corridor.

• List of places with 'Silicon' names