There are several cairns and the remains of a circular British encampment on the mountain between Aberdare and Merthyr.
The older part of the urban district is included in the parliamentary borough of Merthyr Tydfil, and also shares with Merthyr and Aberdare the services of a stipendiary magistrate.
Its station is a terminus on the Barry railway, which starts at Hafod in the Rhondda Valley, where it joins the Taff Vale railway, having also junctions with the same line for Aberdare and Merthyr at Treforest, and for Cardiff and Penarth at Cogan, and with the Great Western main line at Peterstone and St Fagans.
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MOUNTAIN ASH, an urban district of Glamorganshire, south Wales, in the Aberdare valley on the Cynon, a west bank tributary of the Taff, with stations on the Taff Vale and Great Western railways, 18 m.
In November 1893 the University of Wales was incorporated by royal charter, with Lord Aberdare (d.
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.