It's hard to know what is the main monument here - that ruinous passage tomb or the large stone circle that surrounds it.
The tomb has a 10m or so diameter kerb around a very disturbed chamber. The only definite structure is a small part of a chamber of which two wall stones and the backstone remain. It appears that the passage would have faced northwards towards Slieve Glah. One recumbent stone has some possible rock-art on it.
The stone circle is large. Many of the stones are fallen or missing, but enough remain to show that it would have once been impressive at around 40m in diameter.
Later in the day I was told that there is often a bull in the field with these stones, so be careful if you choose to visit.
These monuments are best approached from the north.
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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.