Archif Melville Richards : Cronfa Ddata Enwau Lleoedd ~ Place-Name Database
www.e-gymraeg.co.uk/enwaulleoedd/amr/
A Vision of Britain Through Time
Casgliad y Werin ~ People’s Collection Wales
www.casgliadywerin.cymru/ ~ www.peoplescollection.wales/
Coflein
www.coflein.gov.uk/cy/ ~ www.coflein.gov.uk/
Comisiwn Brenhinol Henebion Cymru ~ Royal Commission on the Ancient and Historical Monuments of Wales
Comisiynydd y Gymraeg ~ Welsh Language Commissioner
www.comisiynyddygymraeg.cymru ~ www.welshlanguagecommissioner.wales
Cyfoeth Naturiol Cymru ~ Natural Resources Wales
Cymdeithas Edward Llwyd
www.cymdeithasedwardllwyd.org.uk
Enwau Cymru
www.e-gymraeg.org/enwaucymru/ ~ www.e-gymraeg.org/enwaucymru/chwilio_en.aspx
Enwau Dyffryn Ogwen
https://enwaudyffrynogwen.org/
Enwau Lleoedd De Cymru
https://sites.google.com/site/enwaulleoedddecymru/
Flood and Flow: Place-Names and the Changing Hydrology of English and Welsh Rivers
https://waternames.wordpress.com/
Gaelic Place-Names of Scotland
https://www.ainmean-aite.scot/
Geiriadur Prifysgol Cymru ~ The University of Wales Dictionary
GB1900
Hanes Dyffryn Ogwen
www.hanesdyffrynogwen.wordpress.com
History Points
Institute for Name Studies
https://www.nottingham.ac.uk/research/groups/ins/index.aspx/
Llên Natur
www.llennatur.com/Drupal7/llennatur/
Lleoedd Cymru: Darganfod Mapiau Degwm Cymru ~ Places of Wales: Discover the Tithe Maps of Wales
https://lleoedd.llyfrgell.cymru/ ~ https://places.library.wales/
MOROL: Sefydliad Astudiaethau Hanes Morwrol Cymru ~ Institute of Welsh Maritime Historical Studies
Old Maps Online
Papurau Newydd Cymru Arlein ~ Welsh Newspapers Online
papuraunewydd.llyfrgell.cymru/ ~ newspapers.library.wales//
Parc Cenedlaethol Eryri ~ Snowdonia National Park
Partneriaeth Tirwedd y Carneddau ~ The Carneddau Landscape Partnership
https://www.eryri.llyw.cymru/looking-after/carneddau-partnership ~ https://www.snowdonia.gov.wales/looking-after/carneddau-partnership
Placenames Database of Ireland
Plas Carmel, Aberdaron
Rhestr o Enwau Lleoedd Hanesyddol Cymru ~ List of Historic Place Names of Wales
https://enwaulleoeddhanesyddol.cbhc.gov.uk/ ~ https://historicplacenames.rcahmw.gov.uk/
Some Place-names in South Wales
http://someplacenamesinsouthwales.mysite.com/index.html
Where’s The Path
wtp2recorder.appspot.com/wheresthepath.htm
Y Ganolfan Uwchefrydiau Cymreig a Cheltaidd ~ The Centre for Advanced Welsh and Celtic Studies
www.cymru.ac.uk/cy/YGanolfanGeltaidd/ ~ www.cymru.ac.uk/en/CentreforAdvancedWelshCelticStudies/
Yr Arolwg Ordnans ~ The Ordnance Survey