The townland of Crunagh is in the parish of Loughgilly in Armagh County. It is labelled number 18 on the map.
The Environment and Heritage Service Sites and Monuments Record (2002) notes the following in this townland:
Rath of the Early Christian Period.
SMR NO: ARM 021:010
Irish Grid Reference: H97703439
CONDITION: some remains
A roughly circular earthwork 49m N-S x47.5 E-W, enclosed by a well defined bank. This stands c1.8m above the interior at SW, becoming lower to S where it is 0.75m high. There are irregularities on E side, associated with the adjacent farmstead, but a break in the bank at SE may mark an original entrance. On N & W there is a formidable ditch up to 3.3m deep below the top of the bank, 1.5m below the exterior & 5.5m wide. No ditch survives on E side, & only traces can be seen on S. See SM7 for further details.
Site of a "Fort".
SMR NO: ARM 021:034
Irish Grid Reference: H97743416
CONDITION: No visible remains
A short portion of a small "Fort" is shown on the OS 6" map of 1835, incorporated into an irregular polygonal enclosure. Only a "Site of Fort" is shown on the 1863 map, and there are now no visible remains. The site was located on a gentle S-facing slope with very good views to the SW & W although it is overlooked by higher ground to the N.
PRONI records: OS/6/2/21/1 (Surveyed 1834-35. Engraved 1835.); OS/6/2/21/2 (Surveyed 1834-35. Engraved 1835. Revised 1860. Revisions engraved 1863.); OS/6/2/21/3 (Surveyed 1834-35. Revised 1906. Published 1908. Reprinted 1921.); OS/6/2/21/4 (Surveyed 1834-35. Revised 1906. Published 1908. (2 copies), Reprints 1934-1957.); OS/6/2/21/5 (Surveyed 1906. Revised 1955. Levelled 1889 and 1906. Published 1958.); VAL/1B/212 (1st valuation records.); VAL/12B/10/34A, VAL/12B/10/34A, VAL/12B/10/34B, VAL/12B/10/34C, VAL/12B/10/21A, VAL/12B/10/21B (Valuation annual revision list.); VAL/2B/2/11 (Griffith valuation list.).