Knocknagin : Passage Tomb

Grid RefO 179 665
Longitude6° 13' 2.55" W
Latitude53° 38' 5.97" N
ITM east480366
ITM north584435
Nearest TownBalbriggan (3.5 Km)
OS Sheet43
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Sunday, 21st October 2001

Driving up the road it is hard to miss this tomb despite it being nothing more than a low mound. What gives it away is the plethora of kerb stones that are still in place, protruding from the soil, although these will probably be hidden when the crop grows.

Its closeness to the road removes all possible atmosphere, but you know it must have been impressive once. Its floor plan is quite huge, maybe some 25m long and 20m wide.

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Sunday, 17th October 2004

I was going to take a good look at this one today, but the field is planted with sprouts. I had forgotten just how big this tomb is.

It looks as though there are still some stones at its centre, but only a proper investigation will tell.

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Like this monument

Marked Sites


From Balbriggan follow the R132 north. Look to the right about 150m after passing the fourth road on the right once you've left the town (around 3km from the edge of Balbriggan).

Random Gazetteer

A Selection of Other Passage Tombs

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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