29 juin 2014. Demat, hello, bonjour,

This article to present a second rivulet called this time, Gyffylliog, Denbighshire, Wales.

I have written a first article about  another "queffelec rivulet" which is in Morbihan south Britanny.

1) Localization & gazette text

2) En Français

3) In English


1) Loacalization & Gazette text:

Gyffylliog river Map 2

Gyffylliog river Map 1


In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Y Gyffylliog like this:

GYFFYLLIOG, or CYFFYLLIOG, a parish and a subdistrict in Ruthin district, Denbigh. The parish lies on a rivulet of its own name, an affluent of the Clwyd, 5 miles West of Ruthin town and r. station; and contains the townships of Ffrithoed, Trefor, Treganol, and Trepark. Post town, Ruthin, Denbighshire. Acres, 6, 652. Real property, £2, 076. Pop., 564. Houses, 114. The property is divided among a few. The living is a p. curacy, annexed to the vicarage of Llanynys, in the diocese of St. Asaph. The church is a poor edifice.—The sub-district contains also two other parishes. Acres, 18, 923. Pop., 1, 326. Houses, 281.


2) En Français:

Dyffryn Clwyd (anglais : Vale of Clwyd « val du Clwyd ») est une vallée étendue située dans le comté de Denbighshire (Pays de Galles). Il est ainsi nommé en raison du Clwyd, fleuve principal de la région qui traverse Rhuthun, Dinbych et Rhuddlan avant de se jeter dans la mer à Rhyl.

Au Moyen Âge, Dyffryn Clwyd était un cantref. Aujourd'hui il est connu pour ses paysages et ses monuments historiques.


Le val du Clwyd est un bassin sédimentaire recouvrant un demi-graben dont le flanc oriental épouse les contours de la faille du val du Clwyd. À l'instar du Bassin du Cheshire, situé plus à l'est, le fond de vallée est tapissé d’épais dépôts de grès du Permien et du Trias. Autour de St Asaph, on rencontre des grès et des mudstones carbonifères, donc plus tardifs. Des îlots de tillite et un amas de drumlins le long du flanc occidental de la vallée, montrent que la région a été arasée au cours des glaciations. Les dépôts alluvionnaires sont épars à travers la plaine inondable de la Clwyd et de ses affluents.


3) In English:

The Vale of Clwyd (Welsh: Dyffryn Clwyd) is a tract of low-lying ground in the county of Denbighshire in northeast Wales. The Vale extends south-southwestwards from the coast of the Irish Sea for some 20 miles (about 30 km) forming a triangle of low ground bounded on its eastern side by the well-defined scarp of the Clwydian Range and to the west by numerous low hills. The River Clwyd (Welsh: Afon Clwyd) which rises within Clocaenog Forest, southwest of Denbigh, runs the full length of the vale. It is joined by the two major left bank tributaries of the River Clywedog (Welsh: Afon Clywedog) and River Elwy (Welsh: Afon Elwy) and the smaller right bank tributary of the River Wheeler (Welsh: Afon Chwiler).

Settlement & Administration

At its seaward end are the coastal resorts of Kinmel Bay (Welsh: Bae Cinmel), Rhyl and Prestatyn whilst the towns of Abergele and St Asaph (Welsh: Llanelwy) lie just inland. The other principal towns of the vale are Denbigh (Welsh: Dinbych) and Ruthin (Welsh: Rhuthun).The area falls within the modern administrative county (and unitary authority) of Denbighshire and much of it lies within the Vale of Clwyd UK Parliamentary constituency


The Vale of Clwyd is a sedimentary basin which takes the form of a half-graben whose eastern margin is marked by the Vale of Clwyd Fault. Like the Cheshire Basin further to its east, it is mostly floored by thick deposits of Permian and Triassic sandstone. Around St Asaph, late Carboniferous, Coal Measures mudstones and sandstones occur. The area was overrun by ice during the ice ages whose legacy is a covering of glacial till across the area and a swarm of drumlins along the western edge of the vale. Alluvium is encountered across the floodplains of the River Clwyd and its tributaries.