Acar y Tyddyn (Field).
Grid Reference: SJ 00669 76513. Parish: Bodelwyddan, Flintshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Alllt Tyddyn (No 1) (Topographic feature).
Grid Reference: SN 25504 28965. Parish: Llanwinio, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Allt Tyddyn (No2) (Topographic feature).
Grid Reference: SN 25654 29513. Parish: Llanwinio, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Bendu tyddyn bach (Field).
Grid Reference: SH 81790 52625. Parish: Penmachno, Caernarfonshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Bryn Tyddyn (Field).
Grid Reference: SH 80280 72208. Parish: Eglwysbach, Denbighshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Bryn Tyddyn isaf (Field).
Grid Reference: SJ 21535 65451. Parish: Mold Rural, Flintshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Bryn Tyddyn isaf (Field).
Grid Reference: SJ 21535 65451. Parish: Mold Rural, Flintshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Bryniau`r Tyddyn (Unclassified).
Grid Reference: SH 50422 42534. Parish: Dolbenmaen, Caernarfonshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cae cefn tyddyn bach (Field).
Grid Reference: SH 48678 70615. Parish: Llanddaniel Fab, Anglesey
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Cae cefn tyddyn belyn (Field).
Grid Reference: SH 21708 36022. Parish: Tudweiliog, Caernarfonshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin