Ballybrittas : Portal Tomb

Grid RefS 927 316
Longitude6° 38' 13.27" W
Latitude52° 25' 41.24" N
ITM east480366
ITM north584435
Nearest TownClonroche (5.9 Km)
OS Sheets68, 69, 77
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Sunday, 9th December 2001

An electric fence stopped me getting right up to this tomb. All that appeared to remain is the circle of kerb stones an possibly an orthostat or two. Some of the stones look quite big and still form a circle resembling more of a henge now.

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Sunday, 6th October 2002

How wrong from 40m away can you be! The stones I had seen on my last visit were a massive heap of field clearance. The tomb itself is tucked away 50m beyond in the corner of the field.

This is a lovely little portal tomb, the capstone of which has slipped off the portal stones and now rests horizontally on the chamber, resembling a megalithic ironing board. The chamber is surrounded by cairn to a height of 50cm and internally measures 1.8m tall, 2m long and 1.2m wide. The capstone is very thin and around 2m square.

A very picturesque tomb in an unfortunately overgrown corner of a field, but very worth a visit.

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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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