aber

aberoedd (plural)
ebyr (plural)
aber
haber (prothesis-h)

From Proto-Brythonic *aber, from Proto-Celtic *adberos.


afon

afonydd (plural)
afon
hafon (prothesis-h)

From Middle Welsh afon, from Proto-Brythonic *aβon, from Proto-Celtic *abū, from Proto-Indo-European *h₂ep-h₃ōn-, from *h₂ep- (“body of water”).


llyn

llynnoedd (plural)
llynnau (plural)
llyn
lyn (soft)

From Middle Welsh llynn, from Proto-Brythonic *llɨnn, from Proto-Celtic *lindos (“lake, liquid”).


môr

cy-noun

môr m (usually uncountable, plural moroedd or morau or mŷr)

moroedd (plural)
morau (plural)
mŷr (plural)
môr
fôr (soft)

From Proto-Brythonic *mor, from Proto-Celtic *mori, from Proto-Indo-European *móri.

(figuratively) plenty, abundance, copiousness


Môr Baltig

Baltic Sea (a sea in northern Europe), connected to the Atlantic.


cefnfor

cefnforoedd (plural)
cefnfor
gefnfor (soft)
nghefnfor
chefnfor


gweilgi

gweilgïoedd (plural)
gweilgi
weilgi (soft)
ngweilgi

From Proto-Celtic *wailos (“wolf, howler”) + ci (“dog”). Compare also Irish faolchú (“wolf”).


pwll

pyllau (plural)
pwll
bwll (soft)
mhwll
phwll

From Middle Welsh pwll, from Proto-Brythonic *pull, from Old English pull, pyll (“tidal pool”) or Old Norse pollr (whence Icelandic pollur), from Proto-Germanic *pullaz (“pool”). Cognate with Breton poull and Cornish, Irish, and Scottish Gaelic poll.


Dyffryn y Brenhinoedd

Dyffryn y Brenhinoedd
Ddyffryn y Brenhinoedd (soft)
Nyffryn y Brenhinoedd

Valley of the Kings
Valley of the Kings#English

Valley of the Kings (Egyptian valley known for its tombs)


bae

baeau anabl


bae

See the etymology of the corresponding lemma form.


llwch

Either borrowed from Goidelic or inherited from *lokku, a geminate form of Proto-Celtic *loku. Compare Irish loch, Scottish Gaelic loch.


Gwy

Unknown; first attested as Old Welsh Guoy. The element -wy is found in other river names such as Monnow, Medway, and Conwy. A borrowing from a Pre-Celtic substrate language cannot be ruled out, as gwy does not match any obvious nouns in Welsh.


porth

From Proto-Brythonic *porθ, borrowed from Latin porta (“gate, passage”).


ffrwd

From Proto-Brythonic *frud, from Proto-Celtic *srutom, from Proto-Indo-European *srew- (“flow, stream”).


Nedd

English: Neath

Neath Port Talbot
Neath Port Talbot#English

Neath (a river in Neath Port Talbot county borough)


Teifi

Of Brythonic origin, probably from the same root as Tafwys and possibly also Thames. Also compare the names Tamar, Tavy, Towy, Teviot, Tweed, Taw, Tiverton.

A river that forms the boundary between Ceredigion and Carmarthenshire


Tafwys

From Proto-Brythonic *taβ̃uɨs, from Proto-Celtic *tamesās, probably ultimately of Celtic origin, but the exact root is unclear; see Thames.


Dyfrdwy

Of Brythonic origin. Equivalent to dwfr (“water”) + dwyw (“god”).


Efyrnwy

Vyrnwy (a river in Powys, Wales and Shropshire, England)


Ogwr

Ogmore (a river in Bridgend county borough)


Wysg

From Middle Welsh Wÿsk, from Proto-Brythonic *Uɨsk, from Proto-Celtic *ɸeiskos (“fish”); cognate with Irish iasc (“fish”).


Llwchwr

→ English: Loughor, Llwchwr

Loughor (a river in Carmarthenshire, and the city and county of Swansea, southern Wales).


Taf

Likely from the same Celtic source of the rivers Tafwys, Teifi, Dyfi, Tawe, from a root meaning "dark" or "water." Also see Thames.


pwll nofio

pyllau nofio (plural)
pwll nofio
bwll nofio (soft)
mhwll nofio
phwll nofio

/ˌpʊɬ ˈnɔvjɔ/

/ˌpʊɬ ˈnɔvjɔ/


camlas

cy-noun

camlas f (plural camlesi or camlasau or camlesydd)

camlesi (plural)
camlasau (plural)
camlesydd (plural)
camlas
gamlas (soft)
nghamlas
chamlas

cam (“crooked; false”) + glas (“stream”)


Clydach

From a Proto-Celtic root meaning "flow strongly".

Clydach (a short river in Monmouthshire, which joins the River Usk).

Clydach (a river in Neath Port Talbot county borough, Wales, which joins the River Neath).


Môr y Canoldir

Mediterranean Sea
Mediterranean Sea#English

Mediterranean Sea (a sea between Europe and Africa)


Môr Marw

the Dead Sea (a highly saline lake in Israel, Palestine and Jordan)


Môr Du

Black Sea (a sea between Europe and Asia)


Afon Merswy

Old English Mæres ēa (“boundary river”).


porthladd

cy-noun

porthladd m (plural porthladdoedd or porthladdau, diminutive porthleddyn)

porthladdoedd (plural)
porthladdau (plural)
porthleddyn (diminutive)
porthladd
borthladd (soft)
mhorthladd
phorthladd

From earlier porthloedd, porthlodd, from porth (“porth”) + *lloedd (“quiet”).


Môr Coch

Calque of Latin Mare Rubrum, itself a calque of Ancient Greek Ἐρυθρᾱ̀ θάλασσα (Eruthrā̀ thálassa).

der

Ἐρυθρᾱ̀ θάλασσα

Red Sea (a sea in the Indian Ocean, between Arabia and Africa)


Culfor Dofr

Strait of Dover (a strait in the English Channel)


culfor

culforoedd (plural)
culfor
gulfor (soft)
nghulfor
chulfor


afonig

afonigion (plural)
afonig
hafonig (prothesis-h)


Donwy

Danube (a river in Europe; flowing 2850 kilometers from the confluence of the Breg and Brigach at Donaueschingen, Germany, into the Black Sea in Romania)