(Gellyoer) (Field).
Grid Reference: SN 34591 38421. Parish: Llangeler, Carmarthenshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

[Avon] Yr Oerva (Topographic feature).
Grid Reference: SH 68128 40837. Parish: Maentwrog, Merionethshire
When recorded: 1699. Primary Source: Parochialia 2. Secondary Source: none

Aber Oer (Field).
Grid Reference: SJ 21462 37612. Parish: Glyntraian, Denbighshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Aber-grugoer (Unclassified).
Grid Reference: SH 81315 68183. Parish: Eglwysbach, Denbighshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Aber-oer (Unclassified).
Grid Reference: SJ 28776 49013. Parish: Esclusham Above, Denbighshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Aber-oer (Unclassified).
Grid Reference: SJ 28478 49294. Parish: Esclusham Above, Denbighshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Acar oer (Field).
Grid Reference: SJ 17226 77330. Parish: Whitford, Flintshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Afon Oernant (Unclassified).
Grid Reference: SH 79361 48057. Parish: Penmachno, Caernarfonshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Allotment on pen yr oerfa (Field).
Grid Reference: SJ 09625 19184. Parish: Llanfyllin, Montgomeryshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Allt Oernant (Unclassified).
Grid Reference: SN 42822 60414. Parish: Llanarth, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website