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Allt diffwys (Field).
Grid Reference: SN 95882 81050. Parish: Llangurig, Montgomeryshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Coed Graig-y-diffwys (Unclassified).
Grid Reference: SN 93783 96859. Parish: Carno, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Craig y Diffwys (Unclassified).
Grid Reference: SN 93889 96904. Parish: Carno, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cwm Diffwys (Unclassified).
Grid Reference: SO 00847 81417. Parish: Llandinam, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Diffwys (Unclassified).
Grid Reference: SH 74891 66310. Parish: Dolgarrog, Caernarfonshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Diffwys (Topographic feature).
Grid Reference: SH 59268 60235. Parish: Llanberis, Caernarfonshire
When recorded: 2024. Primary Source: Menter Fachwen. Secondary Source: Gweithdai Eryri

Diffwys (Unclassified).
Grid Reference: SJ 02401 57586. Parish: Llanrhaiadr yn Cinmerch Rural, Denbighshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Diffwys (Settlement).
Grid Reference: SN 73199 57757. Parish: Caron-îs-Clawdd, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Diffwys Criafol (Topographic feature).
Grid Reference: SH 63396 55536. Parish: Llanberis, Caernarfonshire
When recorded: 2025. Primary Source: Gweithdai Eryri. Secondary Source: none

Diffwys Du (Topographic feature).
Grid Reference: SH 61392 55871. Parish: Llanberis, Caernarfonshire
When recorded: 2025. Primary Source: Gweithdai Eryri. Secondary Source: none