PRONI lists the Divisions and Townlands in the Civil Parish of Termanmongan which covers this area. These are listed on this site 1) sorted by Division, and 2) sorted by proximity (map order).
In the General Alphabetical Index to the Townlands and Towns, an Parishes and Baronies of Ireland, 1851,
Garvagh is listed with a size of 957 acres 1r 3 p,
Garvagh Blane 357a 3r 38p, and
Garvagh Pullens 214a, 1r, 10p.In Griffith's Valuation, 1859, pp 33-34, the area of water in Garvagh (i.e. the Mourne Beg river) is 3a, 2r, 5p.
In the Census of Ireland, 1901, Garvagh is listed as having 23 properties.
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