The district has an area of 10,504 acres and comprises; besides Mountain Ash proper, a string of villages, the chief being Cwmpenar, Penrhiwceiber, Abercynon or Aberdare Junction (at the confluence of the Cynon with the Taff) and Ynysybwl, 3 m.
The district has an area of 10,504 acres and comprises; besides Mountain Ash proper, a string of villages, the chief being Cwmpenar, Penrhiwceiber, Abercynon or Aberdare Junction (at the confluence of the Cynon with the Taff) and Ynysybwl, 3 m.