Watch Hill Castle (also known as Yarwood Castle, Castle Hill, and Bowdon Watch) is an early medieval motte-and-bailey on the border of Bowdon and Dunham Massey, England. It is a Scheduled Ancient Monument. As the only Scheduled Ancient Monument in Trafford, it is arguably the most important archaeological site in the borough.[2] The castle is located north of the River Bollin and south of a deep ravine (grid reference SJ74798598).[2]