[Ffynnon] Gwern y Marl (Topographic feature).
Grid Reference: SJ 22806 68094. Parish: Northop, Flintshire
When recorded: 1699. Primary Source: Parochialia 1. Secondary Source: none

Aber-marlais (Settlement).
Grid Reference: SN 43987 60513. Parish: Henfynyw, Cardiganshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Abermarles (Field).
Grid Reference: SN 44105 60766. Parish: Henfynyw, Cardiganshire
When recorded: Circa 1840. Primary Source: none. Secondary Source: Cynefin

Afon Marlais (Unclassified).
Grid Reference: SN 62272 36111. Parish: Llansawel, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Afon Marlais (Unclassified).
Grid Reference: SN 60934 38170. Parish: Llansawel, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Afon Marlais (Unclassified).
Grid Reference: SN 59742 17864. Parish: Llanfihangel Aberbythych, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Afon Marlais (Unclassified).
Grid Reference: SN 68858 30002. Parish: Llansadwrn, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Afon Marlais (Unclassified).
Grid Reference: SN 59693 39497. Parish: Llansawel, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Afon Marlais (Topographic feature).
Grid Reference: SN 50079 34128. Parish: Llanfihangel-ar-arth, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Afon Marlais (Unclassified).
Grid Reference: SN 51881 30561. Parish: Llanegwad, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website