Claggan : Portal Tomb

CountyDonegal
Grid RefB 994 403
GPSB 99369 40315 (8m)
Longitude8° 0' 35.69" W
Latitude55° 12' 35.65" N
ITM east480366
ITM north584435
Nearest TownDunfanaghy (3.7 Km)
OS Sheet2
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Sunday, 13th March 2005

Only a few upright slabs set into a low cairn remain of this monument, but a visit is rewarded by superb views over the valley below and out over a pretty bay (Poullaguill Bay) to the Atlantic Ocean beyond. Tory Island can be seen to the northwest.

The remains of the gallery align east-west directly towards Crockshee, a nearby round-topped hill. The monument is situated on the edge of a little shelf on the side of a steep south-facing slope. The location has much in common with some Welsh portal tombs .

A cairn is a large pile of stones, quite often (but not always) containing a burial. Sometimes they have a kerb around the base.

Most cairns are hemi-spherical (like half a football), but the piles of stones used to cover wedge tombs, court tombs and portal tombs are also called cairns. When associated with these types of monument they are not always round, but sometimes rectangular or trapezoidal.

Two stones place either side of a gallery, opposite each other, but not touching so as to leave a gap, that are used to segment it into smaller chambers.

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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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