Grey Stone of Trough - Credit: Wikimedia Commons
The Grey Stone of Trough is an historic boundary marker in Bowland Forest High, in the Trough of Bowland, Lancashire, England. A Grade II listed structure, erected in 1897 and standing on Trough Road,Craven Local Plan, November 2019, Craven District Council, p. 94 it marks the line of the pre-1974 county boundary between Lancashire and the West Riding of Yorkshire. Historically, the Trough marked the westernmost boundary of the ancient Lordship of Bowland. Read more on Wikipedia
Source: en.wikipedia.org