Graig is a historic district of the town of Pontypridd, Rhondda Cynon Taf, South Wales. It is also the name of an electoral ward for the town and county councils. Graig was historically referred to as 'Rhiw'. The area is closely associated with coal mining and consists largely of terraced housing. Notable collieries within the area include - Gelli-whion Collie…Graig is a historic district of the town of Pontypridd, Rhondda Cynon Taf, South Wales. It is also the name of an electoral ward for the town and county councils. Graig was historically referred to as 'Rhiw'. The area is closely associated with coal mining and consists largely of terraced housing. Notable collieries within the area include - Gelli-whion Colliery, Newbridge Colliery, Pen-y-rhiw Colliery and Pontypridd Maritime Collieries. Graig today is also home to the Dewi Sant Hospital.