The camps at Pennymuir lie on rough moorland in the Cheviot Hills beside Dere Street, a short distance north of Tow Ford where the Roman road crossed the Kale Water.

[2] It lies close to the west side of Dere Street on a platform of moderately even ground.

[5] The northward gate on the west side had been narrowed at a later date, which may be the result of a later re-occupation of the camp.

[7] The north and east sides (including the northeast corner) are traceable as a low spread turf bank 5 metres wide and 20 centimetres high.

[7] The south and west sides have been obliterated by former cultivation and by recent drainage ditches.

[7] The remains of a later farmstead are situated immediately to the east of the road between the camps, and comprises at least two buildings and five enclosures.