This is a low, almost unspottable, valley bottom cairn. At least it seems to be in the valley bottom, but it's actually in the bottom of the Maum Pass, which is high above the Dalligan Valley. The peat makes it hard to see the true extent of the remains - only the top 30cm or so rises above the peat.
With Farbreaga Mountain to the north and Crohaun Mountain to the south this is a very closed in location, but the views to the southeast open out as far as the coast. It's interesting to note that the huge cairn on Crohaun Mountain ( Crohaun (County Waterford)) can not be seen from here. It seems to have been located to be seen from the flat lands to the west of the mountains.
This is an explanation of (and a bit of a disclaimer for) the coordinates I provide.
Where a GPS figure is given this is the master for all other coordinates. According to my Garmin these are quite accurate.
Where there is no GPS figure the 6 figure grid reference is master for the others. This may not be very accurate as it could have come from the OS maps and could have been read by eye. Consequently, all other cordinates are going to have inaccuracies.
The calculation of Longitude and Latitude uses an algorithm that is not 100% accurate. The long/lat figures are used as a basis for calculating the UTM & ITM coordinates. Consequently, UTM & ITM coordinates are slightly out.
UTM is a global coordinate system - Universal Transverse Mercator - that is at the core of the GPS system.
ITM is the new coordinate system - Irish Transverse Mercator - that is more accurate and more GPS friendly than the Irish Grid Reference system. This will be used on the next generation of Irish OS maps.