The townland of Boheh, Co. Mayo contains one of my favourite examples of outdoor prehistoric rock art in Ireland. Along a narrow side road, hidden away behind derelict housing and high hedgerows, lies a large natural outcrop of rock flecked with quartz strains, known as ‘St. Patrick’s Chair’. Upon its surface (spread out over 4 m2 ) over 250 individual petroglyphs are carved. They take the form of isolated ‘cup’, ‘cup and rings’ and ‘keyhole’ motifs (archaeological designations); and altogether form quite an impressive sight when viewed in the right seasonal and lighting conditions.
Both April 18th and August 24th are two such occasions.
Should you ever chance to find yourself at the site on either the above dates (weather permitting) you may be treated to the prehistoric equivalent of a ‘light show’. Standing at Boheh Rock/St. Patrick’s Chair on the dates above, looking west, the sun appears to set right on the peak of Croagh Patrick itself. Not only that, but it then subsequently appears, to an observer standing at Boheh ‘rock’, that the sun ‘rolls’ down the north side of the conical peak itself.