Beudy Den-boncyn (Unclassified).
Grid Reference: SH 58144 48982. Parish: Beddgelert, Caernarfonshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Boncyn (Unclassified).
Grid Reference: SH 88623 16589. Parish: Llanymawddwy, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Boncyn (Field).
Grid Reference: SH 94354 72357. Parish: Llanfair Talhaiarn, Denbighshire
When recorded: Circa 1840. Primary Source: none. Secondary Source: Cynefin

Boncyn Banhadlen (Unclassified).
Grid Reference: SJ 16878 56649. Parish: Llanfair Dyffryn Clwyd, Denbighshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Boncyn Blaen-y-cwm (Unclassified).
Grid Reference: SH 91977 08275. Parish: Llanbrynmair, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Boncyn Bwlch glas (Unclassified).
Grid Reference: SJ 02992 17578. Parish: Llanfihangel-yng-Ngwynfa, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Boncyn Cammen (Unclassified).
Grid Reference: SJ 06687 19938. Parish: Llanfyllin, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Boncyn Celyn (Unclassified).
Grid Reference: SJ 03691 18299. Parish: Llanwddyn, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Boncyn Crwn (Unclassified).
Grid Reference: SH 91477 15024. Parish: Llanymawddwy, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Boncyn Crwn (Unclassified).
Grid Reference: SH 89275 29028. Parish: Llanuwchllyn, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website