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Wednesday, 19 August 2015

Maps at the National Monuments Record of Wales

Llanidloes area in 1887. 1st ed. OS 25’’ map, Montgomeryshire sheet XLVII.4.


Maps held in the National Monuments Record of Wales are available for consultation by researchers. In addition, Ordnance Survey 25’’-inch and 6’’-inch maps are available to view as layers on GIS.

The nineteenth century saw a dramatic growth of industry, the advent of canals and railways, huge town expansion schemes, and other significant changes to Wales’s former predominantly rural landscapes; many of these changes can be seen on maps from that time.

On a smaller scale, it is often possible to track the development of individual buildings, names of farms and settlements, locations of antiquities, and other landmarks such as wells, milestones and even trees.

You may view the catalogue and digitised collections through Coflein, our on line site database and archive catalogue – or in our library and search room.

Treharris area in 1919, shown on the 2nd edition OS 25’’ map.

Ordnance Survey

• OS ‘Old Series’ 1’’ maps
Produced 1805-73. A volume containing facsimile maps of Wales from this series is available in the library.

• OS County Series 25’’ maps.
The largest scale maps ever produced commercially in the UK, published in stages with the first edition completed in 1890. The NMR holds a unique set of OS surveyors’ Welsh County Series working maps showing the published second edition underlain with information in blue from the earlier series.

• OS 6’’ maps
Reduced from the County Series, these afford a better overview of areas mapped. Provisional Edition (predating the introduction of National Grid References) and a gridded set are available.

• Modern OS maps of Wales in the Landranger and Pathfinder series

Baron Hill Estate, Anglesey estate map from sale catalogue.


• Set of OS 1:10,000 maps forming an index to NAR [National Archaeological Record] cards. The NAR cards contain details of sites and finds, including bibliographic references. They have a bias towards archaeological remains.

• Early twentieth-century estate sales catalogues. Estate sales catalogues contain maps (usually based
on the 25’’ County Series) showing boundaries of the different lots. The lots are described in detail and frequently include names of tenants.

• Maps of the Antonine Wall, Ancient Britain, Roman Britain, Roman and Medieval Bath, Georgian Bath, Viking and Medieval York, Roman and Anglian York, and others.

• Reprints of early maps, including Ogilby’s ribbon road map (1675), Blaeu’s County of Glamorgan (1645), Bowen’s maps of South Wales (1729), Speed’s plan of Cardiff (1610) and others.

• Admiralty charts
Modern maritime charts of Welsh coastal waters.

2nd Edition Ordnance Survey 6’’ map, sheet Glamorgan XXVII NE (1901) Rhondda Valley.


  • Free public enquiry service
  • Priority search service
  • Library and search room
  • Image library
  • Digitisation
  • Digital datasets and mapping
  • Group visits
  • Educational resources
National Monuments Record of Wales search room.

Open: Monday, Tuesday, Thursday and Friday 9:30 – 16:00, Wednesday 10:30 – 16:30.
For further information, please contact our friendly and professional staff at:

NMRW Library and Enquiries Service
Crown Building, Plas Crug, Aberystwyth
Ceredigion, SY23 1NJ

Telephone: +44 (0)1970 621200

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