| Three Rock Mountain | |
|---|---|
| Binn Trí Charraig / Sliabh Ruadh | |
 Masts on Three Rock Mountain | |
| Highest point | |
| Elevation | 448 m (1,470 ft)[1] |
| Coordinates | 53°14′43″N 6°14′21″W / 53.24528°N 6.23917°W[2] |
| Geography | |
  Three Rock Location in Greater Dublin  Three Rock Three Rock (island of Ireland) | |
| Location | Dún Laoghaire–Rathdown, Ireland |
| Parent range | Dublin Mountains |
| OSI/OSNI grid | O176231 |
| Topo map | OSI Discovery No. 50 |
Three Rock Mountain (Irish: Binn Trí Charraig;[3] archaic: Sliabh Ruadh[4]) is a mountain in Co Dublin, Ireland. It is 444 metres (1,457 feet) high[1] and forms part of the group of hills in the Dublin Mountains which comprises Two Rock, Three Rock, Kilmashogue and Tibradden Mountains.[5]
The mountain takes its name from the three groups of granite rocks at the summit.[6] It was once believed that these features were man-made: for instance, Gabriel Beranger wrote of them in 1780, "I take them to be altars upon which sacrifices were offered […] the regularity which is observed in piling them convinces me they are the work of man, as they could not grow in that position".[7] In fact, the three outcrops are tors: natural geological features produced by the gradual process of weathering.[6]
Today, the summit is dominated by the many radio masts and towers that use the site to broadcast their signals across the Dublin area below.[8] The forestry plantations on the slopes consist mainly of Sitka spruce, Japanese larch, Scots pine, Monterey pine and lodgepole pine.[1]
- ^ a b c "Ticknock". Coillte Outdoors. Archived from the original on 26 September 2021. Retrieved 1 August 2010.
- ^ Discovery Series No. 50 (Map). Ordnance Survey Ireland.
- ^ "Three Rock Mountain". Placenames Database of Ireland. Department of Culture, Heritage and the Gaeltacht. Archived from the original on 10 March 2016. Retrieved 6 June 2020.
- ^ "Three Rock Mountain – Archival Records" (jpg). Placenames Database of Ireland. Department of Culture, Heritage and the Gaeltacht. Archived from the original on 6 June 2012. Retrieved 31 July 2010.
- ^ Healy, p. 105.
- ^ a b Joyce, p. 131.
- ^ Joyce, p. 132.
- ^ Pearson, p. 304-305.