Originally in the middle of the Hampton River, this rock marked the start of the boundary line surveyed by Capt. Nicholas Shapley and marked by him AD 1657-HB and SH to determine the line between Hampton and Salisbury. HB meant Hampton Bound and SH was Shapley's mark. The rock was lost for many decades because of the shifting of the river's mouth, but the original course of the river and the Bound Rock were rediscovered in 1937. This historically important boulder, still serving as the boundary marker, was enclosed by the State of New Hampshire that same year.