The Three-Farthing Stone was a stone by the side of the East Road that marked the point where the borders of the Eastfarthing, Westfarthing and Southfarthing of the Shire came together. It was also said to mark a point near the centre of the Shire itself. The stone stood about five miles southeast from Bywater, and exactly fourteen miles west from Frogmorton.
The fourth farthing, the Northfarthing, did not meet the others at the Three-Farthing Stone. Instead, its borders met those of the Westfarthing and Eastfarthing about ten miles north of the Stone, though there is no record of a second three-farthing stone to mark this spot.