Ordnance Survey One-Inch First Edition Old Map of Brecknockshire, Monmouthshire, Herefordshire, Glamorganshire: Old Series map of OS Old Series Map Sheet 42 (Brecknockshire / Monmouthshire inferred).
Please note that the modern reference map on the split screen is intended as a guide only.
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This sheet represents a landscape, characterised by .
The primary archaeological theme is .
The terrain is interpreted using .
Sheet 42 / N° XLII is visible. Large county lettering reads BRECKNOCK across the upper sheet and SHIRE across the lower sheet; Monmouthshire is inferred from the lower-right county lettering and eastern valley/upland pattern. Graticule labels are faint or unreadable, so bounds are reconstructed from neighbouring Sheet 41, identifiable geography, and OS Old Series sheet geometry.
Sheet 42 shows a mixed area of . The map is useful for studying early 19th Century historic settlement patterns, Roman road alignments, early archaeological site indentification, how roads, old tracks, lanes and paths, villages, waterways and field systems related to the wider nineteenth-century landscape.