River mouth
A river mouth (Celtic word ) or a ria (Spanish word) is a Vallée of Fleuve invaded by the sea.
The international geography uses preferably the word ria . In France, the Breton word river mouth is also used.
In Breton the word river mouth indicates the Vallée of a river ennoyée by the rise in the sea level. A Fjord is deep and with stiff side slopes because it was dug by a glacier and one speaks about glacial overdeepening because a glacier is able to dig in lower part of the sea level. A ria on the other hand is a nonglacial valley, dug by a river or rather by a coastal river. The roads of Brest comprise several river mouths, those of the Élorn and the Aulne.
Rias in the Finistere:
- River mouth-Wrac' H ( River mouth Ac' H )
- River mouth-Benoit ( River mouth Benniged )
- River mouth-Ildut ( River mouth Iltud )
Ria in the Coast-with Armor:
- River of the Trieux
Ria in Ille-et-Vilaine:
Ria in Morbihan:
- Ria d' Etel
The North-American Atlantic littoral between New York and the Cap Hatteras are a coast with rias, with the image of the Breton and Irish littorals.
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