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Moel Trwyn-swch (Unclassified).
Grid Reference: SH 80837 44648. Parish: Tir Ifan, Denbighshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Morfa-trwyn-glas (Unclassified).
Grid Reference: SH 17093 30789. Parish: Aberdaron, Caernarfonshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Nant Trwyn Swch (Unclassified).
Grid Reference: SH 92128 60554. Parish: Llansannan, Denbighshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Ogo' twll yn y trwyn (Topographic feature).
Grid Reference: SH 12492 21563. Parish: ,
When recorded: 2019. Primary Source: Map of Bardsey. Secondary Source: none

Ogof Trwyn-myn (Unclassified).
Grid Reference: SH 41789 94860. Parish: ,
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Ogof Trwyn-yr-hwch-bâch (Topographic feature).
Grid Reference: SH 11342 21900. Parish: ,
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Ogof Trwyn-yr-hwch-fawr (Topographic feature).
Grid Reference: SH 11598 21942. Parish: ,
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Pant-y-trwyn (Unclassified).
Grid Reference: ST 19258 92518. Parish: Mynyddislwyn, Monmouthshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Parc Trwyn-du (Unclassified).
Grid Reference: SH 63607 81027. Parish: Llangoed, Anglesey
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Park pentrwyn (Field).
Grid Reference: SN 28900 21062. Parish: Meidrim, Carmarthenshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin