Abertynant (Field).
Grid Reference: SJ 23188 55352. Parish: Llanarmon-yn-Iâl, Denbighshire
When recorded: Circa 1840. Primary Source: none. Secondary Source: Cynefin

Actstyn (Other administrative area). Variant of head-name Axton / Axton
Grid Reference: SJ 10500 80300. Parish: Llanasa, Flintshire
When recorded: 1699. Primary Source: Parochialia 1. Secondary Source: none

Afon Tyn (Unclassified).
Grid Reference: SH 93673 00558. Parish: Llanbrynmair, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Allotment belonging to Tyn-y-Cornel Farm (Field).
Grid Reference: SN 63572 92599. Parish: Llangynfelyn, Cardiganshire
When recorded: Circa 1840. Primary Source: none. Secondary Source: Cynefin

Allt llystyn (Unclassified).
Grid Reference: SN 52786 30996. Parish: Llanfihangel Rhos-y-corn, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Avon Vostyn (Topographic feature).
Grid Reference: SJ 13440 81123. Parish: Llanasa, Flintshire
When recorded: 1699. Primary Source: Parochialia 1. Secondary Source: none

Banc Tyngu (Unclassified).
Grid Reference: SN 79199 67995. Parish: Upper Gwnnws, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Banc tynycornel (Field).
Grid Reference: SN 66560 62172. Parish: Caron-is-clawdd, Cardiganshire
When recorded: Circa 1840. Primary Source: none. Secondary Source: Cynefin

Bank Tyn y Cornel (Field).
Grid Reference: SH 79691 51012. Parish: Penmachno, Caernarfonshire
When recorded: Circa 1840. Primary Source: none. Secondary Source: Cynefin

Bank tynrhos issaf (Field).
Grid Reference: SN 64563 68326. Parish: Lower Lledrod, Cardiganshire
When recorded: Circa 1840. Primary Source: none. Secondary Source: Cynefin