A drystone wall, measuring 11m east/west and a maximum of 5m north/south, built into the south facing hillside. There is an outer wall that stands at 1m high all along except at the eastern end where it reaches 1.5m. The two main chambers are 4m deep by 3m wide. There are small niches on the eastern walls at about 0.5m above the ground and measuring 0.25cmsq. Noted during an upland survey conducted by Archaeophysica during 2005-6