This massive glacial erratic is situated in the Harestone Moss and probably has some local folklore that I can't find. The Hare Cairn and the Temple Stones at Potterton are in the area as is Mundurno.
Just north of the small village of Whitecairns, take the second minor road east. Pull in immediately after the trees on the south side. From here its over the gate and follow the fence south. Unfortunately the massive stone has a rubbish dump of farm waste beginning to gather to its south.
Whilst prancing about I was befriended by some horses who didn't seem to mind my presence. Luckily I had some apples in my rucksack so they ended up being quite content.