Allt Pen-rhiw-oleu (Topographic feature).
Grid Reference: SN 27555 40468. Parish: Cenarth, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Allt Pen-rhiw-rhew (Unclassified).
Grid Reference: SN 39630 43131. Parish: Llandysul, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Allt Pen-rhiw'r-onw (Topographic feature).
Grid Reference: SN 39704 28509. Parish: Cynwyl Elfed, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Allt Pen-y-rhiw (Topographic feature).
Grid Reference: SN 83671 35098. Parish: Llanfair-ar-y-bryn, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Allt Pen-y-rhiw Rhaiadr (Topographic feature).
Grid Reference: SN 76523 42397. Parish: Cilycwm, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Allt Pen-y-rhiw-iâr (Topographic feature).
Grid Reference: SN 76149 48112. Parish: Cilycwm, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Allt Rhiw wenwst (Field).
Grid Reference: SN 94889 53534. Parish: Llanafan Fawr, Brecknockshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Allt Rhiwbren (Unclassified).
Grid Reference: SN 47197 57638. Parish: Llanarth, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Allt Rhiwlug (Unclassified).
Grid Reference: SN 40306 44302. Parish: Llandysul, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Allt Rhiwlug (Unclassified).
Grid Reference: SN 39753 44998. Parish: Llandysul, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website