Allt Cefn-y-gefail (Topographic feature).
Grid Reference: SN 78687 37555. Parish: Llanfair-ar-y-bryn, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Beudy Maes-yr-efail (Unclassified).
Grid Reference: SH 60408 49350. Parish: Beddgelert, Caernarfonshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Beudy`r Efail (Unclassified).
Grid Reference: SH 94055 34645. Parish: Llangower, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Blaen-cwm-yr-efail (Settlement).
Grid Reference: SN 62595 32350. Parish: Talley, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Blaen-y-gefail (Unclassified).
Grid Reference: SN 89351 42285. Parish: Penbuallt, Brecknockshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Bod-gefail (Unclassified).
Grid Reference: SH 39330 47726. Parish: Clynnog-fawr, Caernarfonshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Bonc yr hen efail (Field).
Grid Reference: SH 37060 74388. Parish: Aberffraw, Anglesey
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

bron-y-efail (Unclassified).
Grid Reference: SN 96587 50047. Parish: Llanafan Fechan, Brecknockshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Bron-yr-efail (Unclassified).
Grid Reference: SO 09393 71151. Parish: Abbey Cwmhir, Radnorshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Bron-yr-efail Wood (Unclassified).
Grid Reference: SO 09675 71611. Parish: Abbey Cwmhir, Radnorshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website