Bryn-cyfergyd (Unclassified).
Grid Reference: SH 72179 41313. Parish: Ffestiniog, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Emergyd (Unknown).
Grid Reference: SH 61748 80297. Parish: Llangoed, Anglesey
When recorded: 1568. Primary Source: Cronica Walliae. Secondary Source: none

Ergyd Isaf (Tumuli) (Unclassified).
Grid Reference: SS 79456 88621. Parish: Port Talbot, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Ergyd y Bont (Field).
Grid Reference: SH 97545 45561. Parish: Llangwm, Denbighshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Ergyd-y-gwynt (Unclassified).
Grid Reference: SJ 10525 26559. Parish: Llanrhaeadr-ym-Mochnant, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Llidiart-yr-ergyd (Unclassified).
Grid Reference: SJ 00109 08852. Parish: Llangadfan, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Pen yr Ergyd (Unclassified).
Grid Reference: SN 16080 48571. Parish: Y Ferwig, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Tir-ergyd Balance Pit (Disused) (Unclassified).
Grid Reference: SN 99766 04657. Parish: Aberdare, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website