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Coed tywyll (Field).
Grid Reference: SH 61133 28634. Parish: Llanfair, Merionethshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Cwm Tywyll (Unclassified).
Grid Reference: SJ 04887 33574. Parish: Llandrillo-yn-Edeirnion, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cwm-tywyll (Settlement).
Grid Reference: SN 40891 39422. Parish: Llangeler, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cwm-tywyll (Settlement).
Grid Reference: SN 48520 23913. Parish: Abergwili, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cwm-tywyll (Settlement).
Grid Reference: SN 31147 50506. Parish: Penbryn, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cwm-tywyll (Settlement).
Grid Reference: SN 49844 55580. Parish: Llanfihangel Ystrad, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cwm-tywyll Slate Quarry (Disused) (Unclassified).
Grid Reference: SJ 05324 33600. Parish: Llandrillo-yn-Edeirnion, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cwrt y wyll (Field).
Grid Reference: SN 99830 60489. Parish: Llanwrthwl, Radnorshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Dyffryn tywyll (Field).
Grid Reference: SN 67320 66107. Parish: Upper Lledrod, Cardiganshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Gelly Tywyll (Field).
Grid Reference: SJ 14512 09357. Parish: Castle Caereinion, Montgomeryshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin