(Ynys Seiriol) (Unclassified).
Grid Reference: SH 65472 82101. Parish: ,
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 (Unclassified).
Grid Reference: SN 67133 85483. Parish: Tirymynach, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

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

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: Buan, Caernarfonshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Coed Troed -rhiw-seiri (Unclassified).
Grid Reference: SN 66145 78457. Parish: Melindwr, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Coed Troed-rhiw seiri (Unclassified).
Grid Reference: SN 66957 85011. Parish: Tirymynach, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cwm seiri (Unclassified).
Grid Reference: SN 66026 78148. Parish: Melindwr, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website