Head north from Ardee on the N2 and then take the R171 north. When you reach Tallanstown instead of following the R171 to the right continue north and the motte is about 100m around the corner by the roadside.
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The locals obviously like this feature and have constructed a lovely public park around it. There is nothing special about the mote itself which reaches a height of possibly 5m and is maybe 25m in diameter.