Couesnon
The Couesnon (; br, Kouenon) is a river running from the ''département'' of Mayenne in north-western France, forming an estuary at Mont Saint-Michel. It is long, and its drainage basin is . Its final stretch forms the border between the historical duchies of Normandy and Brittany. Its historically irregular course, alternating between two beds on the north and south of the Mont Saint-Michel but eventually definitely settling to the south bed, inspired the saying "The Couesnon in its madness placed the Mont in Normandy" ("''le Couesnon en sa folie mit le Mont en Normandie''"), as the Mont is just to the Norman side of the river's current mouth. However, the administrative boundary separating the two regions does not depend on the course of the river, and is about six kilometers west of the Mont. Geography The Couesnon, the Sée and the Sélune form part of the complex water system of the bay of Mont Saint-Michel. On one side, the tide brings large quantities of sediment wh ...
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Couesnon Mud
The Couesnon (; br, Kouenon) is a river running from the ''département'' of Mayenne in north-western France, forming an estuary at Mont Saint-Michel. It is long, and its drainage basin is . Its final stretch forms the border between the historical duchies of Normandy and Brittany. Its historically irregular course, alternating between two beds on the north and south of the Mont Saint-Michel but eventually definitely settling to the south bed, inspired the saying "The Couesnon in its madness placed the Mont in Normandy" ("''le Couesnon en sa folie mit le Mont en Normandie''"), as the Mont is just to the Norman side of the river's current mouth. However, the administrative boundary separating the two regions does not depend on the course of the river, and is about six kilometers west of the Mont. Geography The Couesnon, the Sée and the Sélune form part of the complex water system of the bay of Mont Saint-Michel. On one side, the tide brings large quantities of sediment whi ...
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Mont Saint-Michel
Mont-Saint-Michel (; Norman: ''Mont Saint Miché''; ) is a tidal island and mainland commune in Normandy, France. The island lies approximately off the country's north-western coast, at the mouth of the Couesnon River near Avranches and is in area. The mainland part of the commune is in area so that the total surface of the commune is . , the island had a population of 29.Téléchargement du fichier d'ensemble des populations légales en 2019
INSEE The commune's position—on an island just a few hundred metres from land—made it accessible at low tide to the many ...
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Antrain
Antrain (; br, Entraven; Gallo: ''Antrein'') is a former commune in the Ille-et-Vilaine department in the Brittany in northwestern France. On 1 January 2019, it was merged into the new commune Val-Couesnon. Château de Bonnefontaine dates to the second quarter of the 16th century. Population Inhabitants of Antrain are called ''Antrenais'' in French. See also *Communes of the Ille-et-Vilaine department The following is a list of the 333 Communes of France, communes of the Ille-et-Vilaine Departments of France, department of France. The communes cooperate in the following Communes of France#Intercommunality, intercommunalities (as of 2020):

Pontorson
Pontorson () is a commune in the Manche department in north-western France. On 1 January 2016, the former communes of Macey and Vessey were merged into Pontorson. Geography Pontorson is situated about 10 kilometres from the Mont Saint-Michel, to which it is connected by highway and a walking path along the river Couesnon. The river also gives its name to the town's main street. Climate Pontorson has a oceanic climate (Köppen climate classification ''Cfb''). The average annual temperature in Pontorson is . The average annual rainfall is with October as the wettest month. The temperatures are highest on average in August, at around , and lowest in January, at around . The highest temperature ever recorded in Pontorson was on 5 August 2003; the coldest temperature ever recorded was on 11 February 2012. History The town was founded in the 12th century after a vow by William the Conqueror. It was home to a fortress, which was razed to the ground in 1623 by order of King Louis ...
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Ille-et-Vilaine
Ille-et-Vilaine (; br, Il-ha-Gwilen) is a department of France, located in the region of Brittany in the northwest of the country. It is named after the two rivers of the Ille and the Vilaine. It had a population of 1,079,498 in 2019.Populations légales 2019: 35 Ille-et-Vilaine
INSEE

History

Ille-et-Vilaine is one of the original 83 departments created during the on March 4, 1790. It was created from part of the of

Brittany
Brittany (; french: link=no, Bretagne ; br, Breizh, or ; Gallo language, Gallo: ''Bertaèyn'' ) is a peninsula, Historical region, historical country and cultural area in the west of modern France, covering the western part of what was known as Armorica during the period of Roman occupation. It became an Kingdom of Brittany, independent kingdom and then a Duchy of Brittany, duchy before being Union of Brittany and France, united with the Kingdom of France in 1532 as a provinces of France, province governed as a separate nation under the crown. Brittany has also been referred to as Little Britain (as opposed to Great Britain, with which it shares an etymology). It is bordered by the English Channel to the north, Normandy to the northeast, eastern Pays de la Loire to the southeast, the Bay of Biscay to the south, and the Celtic Sea and the Atlantic Ocean to the west. Its land area is 34,023 km2 . Brittany is the site of some of the world's oldest standing architecture, ho ...
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Normandy
Normandy (; french: link=no, Normandie ; nrf, Normaundie, Nouormandie ; from Old French , plural of ''Normant'', originally from the word for "northman" in several Scandinavian languages) is a geographical and cultural region in Northwestern Europe, roughly coextensive with the historical Duchy of Normandy. Normandy comprises mainland Normandy (a part of France) and the Channel Islands (mostly the British Crown Dependencies). It covers . Its population is 3,499,280. The inhabitants of Normandy are known as Normans, and the region is the historic homeland of the Norman language. Large settlements include Rouen, Caen, Le Havre and Cherbourg. The cultural region of Normandy is roughly similar to the historical Duchy of Normandy, which includes small areas now part of the departments of Mayenne and Sarthe. The Channel Islands (French: ''Îles Anglo-Normandes'') are also historically part of Normandy; they cover and comprise two bailiwicks: Guernsey and Jersey, which are B ...
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Rivers Of France
This is a list of rivers that are at least partially in France. The rivers are grouped by sea or ocean. The rivers flowing into the sea are sorted along the coast. Rivers flowing into other rivers are listed by the rivers they flow into. Some rivers (e.g. Sûre/Sauer) do not flow through France themselves, but they are mentioned for having French tributaries. They are given in ''italics''. For clarity, only rivers that are longer than 50 km (or have longer tributaries) are shown. In French, rivers are traditionally classified either as ''fleuves'' when they flow into the sea (or into a desert or lake), or as ''rivières'' when they flow into another river. The ''fleuves'' are shown in bold. For an alphabetical overview of rivers of France, see the category Rivers of France. Tributary list North Sea The rivers in this section are sorted north-east (Netherlands) to south-west ( Calais). * Rhine/Rhin (main branch at Hook of Holland, Netherlands) ** Moselle (in Koblenz, Germ ...
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Turbidity
Turbidity is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key test of water quality. Fluids can contain suspended solid matter consisting of particles of many different sizes. While some suspended material will be large enough and heavy enough to settle rapidly to the bottom of the container if a liquid sample is left to stand (the settable solids), very small particles will settle only very slowly or not at all if the sample is regularly agitated or the particles are colloidal. These small solid particles cause the liquid to appear turbid. Turbidity (or haze) is also applied to transparent solids such as glass or plastic. In plastic production, haze is defined as the percentage of light that is deflected more than 2.5° from the incoming light direction. Causes and effects Turbidity in open water may be caused by growth of phyto ...
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Tidal Bore
Tidal is the adjectival form of tide. Tidal may also refer to: * ''Tidal'' (album), a 1996 album by Fiona Apple * Tidal (king), a king involved in the Battle of the Vale of Siddim * TidalCycles, a live coding environment for music * Tidal (service), a music streaming service * Tidal, Manitoba, Canada ** Tidal station, Tidal, Manitoba See also * Tidal flow (traffic), the flow of traffic thought of as an analogy with the flow of tides * Tidal force, a secondary effect of the force of gravity and is responsible for the tides * Tide (other) A tide is the rise and fall of a sea level caused by the Moon's gravity and other factors. Tide may also refer to: Media * ''The Tide'' (Nigeria), a newspaper * ''Tide'' (TV series), 2019 Irish/Welsh/Scottish documentary series * WTKN, a radio s ...

Secchi Disc
The Secchi disk (or Secchi disc), as created in 1865 by Angelo Secchi, is a plain white, circular disk in diameter used to measure water transparency or turbidity in bodies of water. The disc is mounted on a pole or line, and lowered slowly down in the water. The depth at which the disk is no longer visible is taken as a measure of the transparency of the water. This measure is known as the Secchi depth and is related to water turbidity. Since its invention, the disk has also been used in a modified, smaller diameter, black and white design to measure freshwater transparency. Similar disks, with a black-and-yellow pattern, are used as fiducial markers on vehicles in crash tests, crash-test dummies, and other kinetic experiments. History The original Secchi disk was a plain white disk and was used in the Mediterranean Sea. Today, a plain white, diameter Secchi disk remains the standard design used in marine studies. In 1899 George C. Whipple modified the original all-white Se ...
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Manche
Manche (, ) is a coastal French département in Normandy, on the English Channel, which is known as ''La Manche'', literally "the sleeve", in French. It had a population of 495,045 in 2019.Populations légales 2019: 50 Hérault
INSEE

History

Manche is one of the original 83 départements created during the on March 4, 1790. It was created from part of the province of Normandie. The first capital was until 1796, and it res ...
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