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Afon Twllan (Unclassified).
Grid Reference: SH 90057 53296. Parish: Pentrefoelas, Denbighshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Birtwll (Field).
Grid Reference: SN 85341 26284. Parish: Traean-glas, Brecknockshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Blainant twll (Field).
Grid Reference: SJ 11884 73172. Parish: Aberwheeler, Denbighshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Braich y Twll (Unclassified).
Grid Reference: SH 89315 24238. Parish: Llanuwchllyn, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Bryn y twllunior (Field).
Grid Reference: SJ 31628 50046. Parish: Berse, Denbighshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Buarth twll (Field).
Grid Reference: SH 72438 28860. Parish: Trawsfynydd, Merionethshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Buarth Twll du (Field).
Grid Reference: SH 61815 34074. Parish: Talsarnau, Merionethshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Buches y Twll (Field).
Grid Reference: SH 79289 49871. Parish: Penmachno, Caernarfonshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Cae dan Werglodd y twll (Field).
Grid Reference: SH 52144 39809. Parish: Dolbenmaen, Caernarfonshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Cae Issa Tyn y twll (Field).
Grid Reference: SJ 07109 01105. Parish: Llanwyddelan, Montgomeryshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin