Allt Cwm-cerwyni (Topographic feature).
Grid Reference: SN 41744 28607. Parish: Llanpumsaint, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Blaen-cwmcerwyn (Unclassified).
Grid Reference: SS 83440 90138. Parish: Cwmdu, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cae cerwynau (Field).
Grid Reference: SN 41813 28210. Parish: Llanpumsaint, Carmarthenshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Cwmcerwyn (Unclassified).
Grid Reference: SS 83724 90720. Parish: Port Talbot, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cwm-cerwyn (Settlement).
Grid Reference: SN 11302 31184. Parish: Mynachlog-ddu, Pembrokeshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cwmcerwyn Tunnel (Unclassified).
Grid Reference: SS 83427 91351. Parish: Port Talbot, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Foel Cwm-cerwyn (Topographic feature).
Grid Reference: SN 09284 31121. Parish: Llandilo, Pembrokeshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Nant Cwm cerwyni (Topographic feature).
Grid Reference: SN 41781 28104. Parish: Llanpumsaint, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Nant Cwmcerwyn (Unclassified).
Grid Reference: SS 83881 90793. Parish: Cwmdu, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website