Cadair Edward (Site of) (Unclassified).
Grid Reference: SS 85218 89873. Parish: Cwmdu, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cadair Wmphra (Unclassified).
Grid Reference: SH 42071 94463. Parish: Amlwch, Anglesey
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cadair y Cythraul (Unclassified).
Grid Reference: SH 39594 64270. Parish: Newborough, Anglesey
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cadair y Cythraul (Unclassified).
Grid Reference: SH 39021 63671. Parish: Newborough, Anglesey
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cadair-Elwa (Unclassified).
Grid Reference: SH 44695 41739. Parish: Llanystumdwy, Caernarfonshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Nant Cadair (Topographic feature).
Grid Reference: SH 72376 12542. Parish: Tal-y-llyn, Merionethshire
When recorded: 2021. Primary Source: Paul Williams Cadair. Secondary Source: none

Pencadair (Settlement). Variant of head-name Capel Pencader / Capel Pencader
Grid Reference: SN 45000 39000. Parish: Llanfihangel-ar-arth, Carmarthenshire
When recorded: 1568. Primary Source: Cronica Walliae. Secondary Source: none