Welsh is a Celtic language, spoken by roughly half a million people as their first language. The majority of those are in Wales, where an effort has been made to revive the language. There are also thought to be around 200,000 in England, many of them in London or near the border with Wales. There is a Welsh community in the Chubut Valley in Argentine Patagonia, descendents of a group who left Wales in 1865. There are also Welsh speakers recorded in the censuses of the United States, Canada and Australia.
Territory size shows the proportion of all people who speak Welsh as a first language that live in that territory.