Cae'r offeiriad (Field).
Grid Reference: SH 80004 75275. Parish: Llansanffraid Glan-Conwy, Denbighshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Coed Maes-yr-Offeiriad (Topographic feature).
Grid Reference: SN 73102 32574. Parish: Llandingad Without, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cwar yr Offeiriad (Unclassified).
Grid Reference: SS 91160 98172. Parish: Rhondda, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Ddol Offeiriad (Field).
Grid Reference: SH 79112 03498. Parish: Llanwrin, Montgomeryshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Erw'r offeiriad (Field).
Grid Reference: SH 80442 74550. Parish: Llansanffraid Glan-Conwy, Denbighshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Foty yr Offeiriad (Field).
Grid Reference: SJ 01721 47072. Parish: Bettws Gwerfil Goch, Merionethshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Garddyr offeiriad (Field).
Grid Reference: SH 79466 63533. Parish: Llanddoged, Denbighshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Hafod Offeiriad (Field).
Grid Reference: SH 73574 41813. Parish: Ffestiniog, Merionethshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Hafod Yr Offeiriad (Unclassified).
Grid Reference: SH 73469 41707. Parish: Ffestiniog, Merionethshire
When recorded: . Primary Source: none. Secondary Source: Merionethshire Inventory RCAHMW

Hafod-Offeiriad (Unclassified).
Grid Reference: SH 73510 41677. Parish: Ffestiniog, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website