Tullyarvan Stone Ringfort and Man-made underground passage

Internal diam. c. 14.5m. A curving modern wall seems to reflect the W section of a destroyed cashel. The interior is level except for a slight depression said to be the N end of a Man-made underground passage (DG029-019002-) which can be entered from outside the enclosure area to the S. The Man-made underground passage consists of a main passage extending 7m N towards the cashel before being blocked by loose stones and soil. The walls are of drystone construction and the roof consists of 9 flagstones. It is 1m wide and 0.8m high. It is entered by an aperture .33m × 0.65m now blocked by stones. 2.3m from this entrance a passage .55m wide × 0.4m high turns to the W. It is roofed by 4 flags and extends 3m before being blocked. A second passage 5.6m from the present entrance and also leading W is .65m wide and 0.25m high. Two flagstones roof the passage which is likewise blocked at 2m. The site is located on high ground sloping to the S and W but now much built-over. The above description was derived from the 'Archaeological Survey of County Donegal. A description of the field antiquities of the County from the Mesolithic Period to the 17th century.' Compiled by: Brian Lacey with Eamon Cody, Claire Cotter, Judy Cuppage, Noel Dunne, Vincent Hurley, Celie O'Rahilly, Paul Walsh and Seán Ó Nualláin (Lifford: Donegal County Council, 1983). In certain instances the entries have been revised and updated. Date of upload: 22 September 2008

Tullyarvan Stone Ringfort is a circular earthen and stone fortification, likely dating to the early medieval period, used as a defensive or agricultural settlement. Local tradition associates the site with a man-made underground passage, and the presence of a possible destroyed cashel suggests a complex historical and possibly sacred landscape, with folklore potentially linking it to fairy or other supernatural activity.