where is caerphilly
For other uses, see Caerphilly (disambiguation). Caerphilly (/kÉÉrËfÉªli/; Welsh: Caerffili, Welsh pronunciation: [ËkÉËÉ¨rËfÉªlÉª]) is a town in South Wales, at the southern end of the Rhymney Valley. It is the largest town in Caerphilly (county borough). Historically it was in the county of Glamorgan, on the border with Monmouthshire.