Rathcroghan : Souterrain

Grid RefM 798 829
GPSM 79776 82860 (3m)
Longitude8° 18' 24.95" W
Latitude53° 47' 41.55" N
ITM east480366
ITM north584435
Nearest TownElphin (9.5 Km)
OS Sheet33
UTM zone29U
UTM x449041
UTM y5761192
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Show inline map (by Google Maps)

Visit Notes

Saturday, 24th July 2010

This turned out to be the unexpected final monument of the day on the Megalithomania 2010 Meet-Up. Most of us were back at the cars when a call came through from some of the stragglers that they'd found a souterrain. We walked back up to take a look and have a bit of a chat.

There isn't much to see here - just the entrance with its large, exposed lintel. It is in the centre of a massive enclosure formed with a low bank. You can see no more than 2m inside the passage, which is heavily silted up.

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About Coordinates Displayed

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.

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