Athenree : Portal Tomb

Grid RefH 629 714
GPSH 62884 71409 (8m)
Longitude7° 1' 37.93" W
Latitude54° 35' 13.05" N
ITM east480366
ITM north584435
Nearest TownOmagh (17 Km)
OS Sheet13
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Sunday, 4th January 2004

It was raining by now, so I decided to head home and try to finally get to this tomb. I have driven past many times, but it's always been late at night. This time it was geeting dark, but I stopped off anyway.

The capatone of this tomb is a monster. A big, flat slab 3m square. Not surprisingly the chamber has collapsed under its weight, leaving one end resting on the ground and the front resting against the back of the two portal stones . There is one of the side stones from the chamber lying twisted below the capstone.

Unusually, unless the capstone somehow tipped forward, this tomb faces northwest.

The portal stones are each over 2m tall. With a capstone this big it would have been a very impressive structure when whole.

Portal stones are a pair of upright stones that form the 'entrance' to a portal tomb. They are usually well matched, being of even dimensions. As well as forming this doorway they also act as the front support for the capstone and are usually taller than the stones that form the chamber.

Often there is a door stone in between them blocking off access to the chamber within.

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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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