Knockbrack : Artificial Mound

CountyDublin
Grid RefO 155 597
GPSO 15488 59746 (5m)
Longitude6° 15' 22.78" W
Latitude53° 34' 29.53" N
ITM east480366
ITM north584435
Nearest TownBalbriggan (6.2 Km)
OS Sheet43
UTM zone29U
UTM x449041
UTM y5761192
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Show inline map (by Google Maps)

Visit Notes

Sunday, 17th October 2004

High above the Delvin River these four mounds mirror those at Fourknocks (County Meath) on the opposite side. These two major groups combin to make the Delvin valley a very special place indeed.

The mounds seem to be in two pairs with the best pair being the southern ones. These offer spectacular views to the coast near to Bremore (County Dublin) and south towards Lambay, which almost seems to sit on the near horizon created by the edge of this hill!

None of these mounds exhibit any signs of kerbs, but neither did the tombs at Fourknocks. Their lofty position also points to them being passage tombs.

400m south on the very highest point of the hill there is a hillfort, which incorporates another passage tomb.

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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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