Taff’s Well thermal spring is located in Taff’s Well or Taffs Well (Welsh: Ffynnon Taf) north of Cardiff, South Wales, UK (National Grid Reference ST 11925 83639) and an elevation of about 30m AOD. It is the only thermal spring in Wales. The spring emerges on the eastern bank of the River Taff and has been contained within a brick well structure and building. Access is via Taff’s Well park, a public park, owned and maintained by “Rhondda Cynnon Taff Council”
https://en.wikipedia.org/wiki/Taff’s_Well_Thermal_Spring
