Taff's Well is a semi-rural village, community and electoral ward located at the south-eastern tip of Rhondda Cynon Taf, 6 miles (9.7 km) to the north of Cardiff, the capital city of Wales. Known locally as the 'Gates to the Valleys' by some and considered part of the Valleys by others, it is separated from Gwaelod-y-Garth by the River Taff. Taff's Well is distinguished because it contains the only thermal spring in Wales. The tepid water is thought to rise along a fault-line from the Carboniferous Limestone, in somewhat similar manner to the warm springs at Bristol and Bath. The Welsh myth of the Taff's Well Turtle originates here. Various religious groups regard it as a spiritual site.