The townland of Federnagh is in the parish of Ballymore in Armagh County. It is labelled number 29 on the map.
The Environment and Heritage Service Sites and Monuments Record (2002) notes the following in this townland:
PRONI records: OS/6/2/18/1 (Surveyed 1835. Engraved 1835.); OS/6/2/18/2 (Surveyed 1835. Engraved 1835. Revised 1860. Engraved 1863.); OS/6/2/18/3 (Surveyed 1835. Revised 1906. Published 1908.); OS/6/2/18/4 (Surveyed 1835. Revised 1906. Published 1908. (2 copies - 1st a reprint 1930, 1933 and 2nd reprint 1933, 1939, 1942, 1946, 1955.); OS/6/2/18/5 (Surveyed 1906. Revised 1954-5. Levelled 1892, 1901-2, 1904 and 1906. Published 1958 (2 copies).); VAL/1B/214 (1st valuation records.); VAL/12B/15/23A, VAL/12B/15/23B, VAL/12B/15/23C, VAL/12B/15/23D, VAL/12B/15/23E (Valuation annual revision list.); VAL/2B/2/32C (Griffith valuation list.).