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

Craig yr Aderyn (Topographic feature).
Grid Reference: SH 64266 06820. Parish: Tywyn, Merionethshire
When recorded: 2024. Primary Source: Cylch yr Iaith. Secondary Source: none

Craig yr Aderyn (Birds' Rock) (Unclassified).
Grid Reference: SH 64266 06820. Parish: Tywyn, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Gorsedd-aderyn (Unclassified).
Grid Reference: SH 31532 84865. Parish: Llanfachraeth, Anglesey
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Karreg yr Aderyn (Topographic feature).
Grid Reference: SH 83020 24860. Parish: Llanuwchllyn, Merionethshire
When recorded: 1699. Primary Source: Parochialia 2. Secondary Source: none

Lletty`r-aderyn (Unclassified).
Grid Reference: SJ 09746 13944. Parish: Llanfihangel-yng-Ngwynfa, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Lletty-aderyn (Unclassified).
Grid Reference: SO 07591 89399. Parish: Mochdre, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Lletty'r-aderyn (Settlement).
Grid Reference: SM 80160 28125. Parish: St Davids, Pembrokeshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Lletty'r-aderyn (Settlement).
Grid Reference: SN 53192 31779. Parish: Llanfihangel Rhos-y-corn, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Lletty's aderyn (Field).
Grid Reference: SH 26178 33192. Parish: Botwnnog, Caernarfonshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin