The hamlet of New Mousen and Mousen Hall are located by the A1 road about 1½ miles south-east of Belford. Old Mousen is ¾ mile to the south-west and was once the location of a medieval village. To the north of New Mousen, Mousen Bridge carries the A1 road over Mousen Burn. Mousen Barns is to the east. Historically, Mosen was a township in the ancient parish of Bambrough.
MOUSON, a township, in the parish of Bambrough, union of Belford, N. division of the ward of Bambrough and of the county of Northumberland, 2¼ miles (S.S.E.) from Belford; containing 72 inhabitants. It lies to the north of Bell's Hill, and on the west of the road between Belford and Alnwick. The township is the property of Haydon-Bridge school. Vestiges of a Roman camp are to be traced on the east side of the road.