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Allt Lletty'r-aderyn (Topographic feature).
Grid Reference: SN 53272 32000. Parish: Llanfihangel-Rhos-y-Corn, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Bryn-aderyn (Unclassified).
Grid Reference: SJ 11199 26182. Parish: Llanrhaiadr-ym-Mochnant, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Bwlch-yr-aderyn (Unclassified).
Grid Reference: SN 70908 75818. Parish: Upper Llanfihangel-y-Creuddyn, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Careg Aderyn (Topographic feature).
Grid Reference: SN 13545 49847. Parish: St. Dogmells Rural, Pembrokeshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Careg yr Aderyn (Topographic feature).
Grid Reference: SH 83020 24860. Parish: Llanuwchllyn, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Clogwyn Maen Aderyn (Settlement).
Grid Reference: SH 61766 49886. Parish: Beddgelert, Caernarfonshire
When recorded: 2025. Primary Source: Gweithdai Eryri. Secondary Source: none

Cnwc-aderyn (Settlement).
Grid Reference: SN 12292 27470. Parish: Llangolman, Pembrokeshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Coed Lletty`r-aderyn (Unclassified).
Grid Reference: SJ 09648 13791. Parish: Llanfihangel-yng-Ngwynfa, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Craig Aderyn (Topographic feature).
Grid Reference: SH 65100 53400. Parish: Beddgelert, Caernarfonshire
When recorded: 2024. Primary Source: Gweithdai Eryri. Secondary Source: none

Craig Aderyn (Topographic feature).
Grid Reference: SH 66351 22433. Parish: Llanaber, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website