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This oval cashel with souterrain is on the northeast slope of the mountain east of Lough Island Reavy, Castlewellan.
The walls are built of drystone and around 10ft thick. The souterrain is in the southeast corner of the enclosure, T-shaped in plan and constructed of dry-stone masonry and roofed with stone lintels. The main passage is about 7ft high and aligned northeast/southwest.
This enclosure was built in the early christian period (6th century) as a farmstead enclosure for cattle and sheep at night. It probably also offered the farmer and his family protection against invaders.
Open to the public (sometimes public access is restructed due to works)