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Lletty's aderyn (Field).
Grid Reference: SH 26246 33178. Parish: Botwnnog, Caernarfonshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Nant Aderyn (Unclassified).
Grid Reference: SN 91196 68857. Parish: Llansantffraed Cwmdeuddwr, Radnorshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Nant Esgair-aderyn (Unclassified).
Grid Reference: SN 73238 87109. Parish: Ceulan-a-Maesmor, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Nyth-aderyn (Topographic feature).
Grid Reference: SN 13440 01295. Parish: Tenby St Mary in Liberty, Pembrokeshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Ogof Aderyn (Topographic feature).
Grid Reference: SM 87922 36922. Parish: ,
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Pen Dal-aderyn (Topographic feature).
Grid Reference: SM 71290 23309. Parish: ,
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Rhyd aderyn (Field).
Grid Reference: SH 90341 66461. Parish: Llanfair Talhaiarn, Denbighshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Rhyd-aderyn (Unclassified).
Grid Reference: SO 08129 89348. Parish: Mochdre, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Rhyd-yr-aderyn (Unclassified).
Grid Reference: SH 84111 04621. Parish: Cemmaes, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Twyn'r aderyn-du (Unclassified).
Grid Reference: ST 12467 82177. Parish: Pentyrch, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website