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(Ynys Seiriol) (Unclassified).
Grid Reference: SH 65472 82101. Parish: , Maritime
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Allt Cwm-seiri (Topographic feature).
Grid Reference: SN 60556 33148. Parish: Talley, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Allt Pant-y-seiri (Topographic feature).
Grid Reference: SN 53146 41455. Parish: Llanybyther, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Banc Troed-rhiw-seiri (Topographic feature).
Grid Reference: SN 67133 85483. Parish: Tir-y-Mynach, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Bryn-seiri (Unclassified).
Grid Reference: SH 49276 78810. Parish: Llanddyfnan, Anglesey
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Bryn-seiri (Unclassified).
Grid Reference: SH 77890 76264. Parish: Gyffin, Caernarfonshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Bryn-seiri (Unclassified).
Grid Reference: SH 78066 76265. Parish: Gyffin, Caernarfonshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cae Pantseirifawr (Field).
Grid Reference: SN 30293 48373. Parish: Bettws-Evan, Cardiganshire
When recorded: 2025. Primary Source: Cymuned Penbryn. Secondary Source: none

Cae Seiri (Field).
Grid Reference: SH 57247 70247. Parish: Pentir, Caernarfonshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Cae'r Seiri (Field).
Grid Reference: SH 29851 35582. Parish: Llanfihangel Bachellaeth, Caernarfonshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin