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Gelly Tywyll (Field).
Grid Reference: SJ 14607 09364. Parish: Castle Caereinion, Montgomeryshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Hafodtywyll (Field).
Grid Reference: SH 66189 12473. Parish: Llangelynin, Merionethshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Llwyn per tywyll (Field).
Grid Reference: SH 62837 06809. Parish: Llanegryn, Merionethshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Llwyn Tywyll (Unclassified).
Grid Reference: SJ 12974 21124. Parish: Llanfyllin, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Llwyn-tywyll (Settlement).
Grid Reference: SN 69535 30738. Parish: Llansadwrn, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Llwyntywyll Farm (Field).
Grid Reference: SN 69370 31015. Parish: Llansadwrn, Carmarthenshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Nant Cwm tywyll (Unclassified).
Grid Reference: SJ 04521 33619. Parish: Llandrillo-yn-Edeirnion, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Pant Tywyll (Unclassified).
Grid Reference: SH 86676 14986. Parish: Mallwyd, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Pant -tywyll-ucahf (Unclassified).
Grid Reference: SH 87114 15104. Parish: Mallwyd, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Pant-tywyll (Unclassified).
Grid Reference: SJ 11322 43115. Parish: Corwen, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website