Although I drove the Ring of Kerry a few times, I never stopped to examine this site, as there was no entry on TMA. This time my wife convinced me, that this must be a megalithic site, so we pulled over.
According to Megalithic Survey, it is wholly natural in origin, though local tradition regards the site as a burial monument (see entry for SMR KE106-119---- at the National Monument Service Website.
It consist of a massive "boulder", which rests on four supporting stones.
Worth a short break, as it just lies a few metres from the road.