Next to the Three Shire Stone is this plaque explaining things. In case you can't quite make it out, it says:
THREE SHIRE STONES
Three stones have traditionally marked the adjoining counties of Cumberland, Westmorland and Lancashire on this site.
The limestone monolith carved in 1816 for the Furness Roadmaster William Field of Cartmel (D. 1860) was set up by friends after his death.
Repaired and re-erected by the National Trust in 1998 with local support.