Stonehenge and its Environs 134
Image by RiotGibbon

... there is a source of Bluestone in Kerry.

T.C. Lethbridge (an accomplished sailor) reckoned the sea journey needed to bring the stones from Ireland went through easier waters than the trip from Wales.

If the bluestones were also previously another circle or structure then they will have been transported from a third location (other than the originating quarry).