A river is a natural flowing watercourse freshwater, flowing towards an ocean, lake or another river. In some cases a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Small rivers can be referred to using names such as stream, brook and rill. There are no official definitions for the generic term river as applied to geographic features, although in some countries or communities a stream is defined by its size. Many names for small rivers are specific to geographic location. Sometimes a river is defined as being larger than a creek, but not always: the language is vague. Rivers are part of the hydrological cycle. Potamology is the scientific study of rivers, while limnology is the study of inland waters in general. Most of the major cities of the world are situated on the banks of rivers, as they are, or were, used as a source of water, for obtaining food, for transport, as borders, as a defensive measure, as a source of hydropower to drive machinery, for bathing, as a means of disposing of waste.
A river begins at a source, follows a path called a course, ends at a mouth or mouths. The water in a river is confined to a channel, made up of a stream bed between banks. In larger rivers there is also a wider floodplain shaped by flood-waters over-topping the channel. Floodplains may be wide in relation to the size of the river channel; this distinction between river channel and floodplain can be blurred in urban areas where the floodplain of a river channel can become developed by housing and industry. Rivers can flow down mountains, through valleys or along plains, can create canyons or gorges; the term upriver refers to the direction towards the source of the river, i.e. against the direction of flow. The term downriver describes the direction towards the mouth of the river, in which the current flows; the term left bank refers to the left bank in the direction of right bank to the right. The river channel contains a single stream of water, but some rivers flow as several interconnecting streams of water, producing a braided river.
Extensive braided rivers are now found in only a few regions worldwide, such as the South Island of New Zealand. They occur on peneplains and some of the larger river deltas. Anastamosing rivers are quite rare, they have multiple sinuous channels carrying large volumes of sediment. There are rare cases of river bifurcation in which a river divides and the resultant flows ending in different seas. An example is the bifurcation of Nerodime River in Kosovo. A river flowing in its channel is a source of energy which acts on the river channel to change its shape and form. In 1757, the German hydrologist Albert Brahms empirically observed that the submerged weight of objects that may be carried away by a river is proportional to the sixth power of the river flow speed; this formulation is sometimes called Airy's law. Thus, if the speed of flow is doubled, the flow would dislodge objects with 64 times as much submerged weight. In mountainous torrential zones this can be seen as erosion channels through hard rocks and the creation of sands and gravels from the destruction of larger rocks.
A river valley, created from a U-shaped glaciated valley, can easily be identified by the V-shaped channel that it has carved. In the middle reaches where a river flows over flatter land, meanders may form through erosion of the river banks and deposition on the inside of bends. Sometimes the river will cut off a loop, shortening the channel and forming an oxbow lake or billabong. Rivers that carry large amounts of sediment may develop conspicuous deltas at their mouths. Rivers whose mouths are in saline tidal waters may form estuaries. Throughout the course of the river, the total volume of water transported downstream will be a combination of the free water flow together with a substantial volume flowing through sub-surface rocks and gravels that underlie the river and its floodplain. For many rivers in large valleys, this unseen component of flow may exceed the visible flow. Most but not all rivers flow on the surface. Subterranean rivers flow underground in caverns; such rivers are found in regions with limestone geologic formations.
Subglacial streams are the braided rivers that flow at the beds of glaciers and ice sheets, permitting meltwater to be discharged at the front of the glacier. Because of the gradient in pressure due to the overlying weight of the glacier, such streams can flow uphill. An intermittent river only flows and can be dry for several years at a time; these rivers are found in regions with limited or variable rainfall, or can occur because of geologic conditions such as a permeable river bed. Some ephemeral rivers flow during the summer months but not in the winter; such rivers are fed from chalk aquifers which recharge from winter rainfall. In England these rivers are called bournes and give their name to places such as Bournemouth and Eastbourne. In humid regions, the location where flow begins in the smallest tributary streams moves upstream in response to precipitation and downstream in its absence or when active summer vegetation diverts water for evapotrans
Rohan is a commune in the Morbihan department in Brittany in north-western France. It is the home to the House of Rohan, members of which included viscounts and princes and has had a prominent role in French history; the commune's coat of arms is identical to that of the family. Rohan is situated on the banks of the river Oust and the Canal from Nantes to Brest, upstream of Josselin and at the edge of a plateau. Inhabitants of Rohan are called Rohannais. Communes of the Morbihan department Mayors of Morbihan Association INSEE commune file French Ministry of Culture list for Rohan
Brittany is a cultural region in the northwest of France, covering the western part of what was known as Armorica during the period of Roman occupation. It became an independent kingdom and a duchy before being united with the Kingdom of France in 1532 as a province governed as if it were a separate nation under the crown. Brittany has been referred to as Less, Lesser or Little Britain, it is bordered by the English Channel to the north, the Celtic Sea and the Atlantic Ocean to the west, the Bay of Biscay to the south. Its land area is 34,023 km². Brittany is the site of some of the world's oldest standing architecture, home to the Barnenez, the Tumulus Saint-Michel and others, which date to the early 5th millennium BC. Today, the historical province of Brittany is split among five French departments: Finistère in the west, Côtes-d'Armor in the north, Ille-et-Vilaine in the north east, Loire-Atlantique in the south east and Morbihan in the south on the Bay of Biscay. Since reorganisation in 1956, the modern administrative region of Brittany comprises only four of the five Breton departments, or 80% of historical Brittany.
The remaining area of old Brittany, the Loire-Atlantique department around Nantes, now forms part of the Pays de la Loire region. At the 2010 census, the population of historic Brittany was estimated to be 4,475,295. Of these, 71 % lived in the region of Brittany. In 2012, the largest metropolitan areas were Nantes and Brest. Brittany is the traditional homeland of the Breton people and is recognised by the Celtic League as one of the six Celtic nations, retaining a distinct cultural identity that reflects its history. A nationalist movement seeks greater autonomy within the French Republic; the word Brittany, along with its French and Gallo equivalents Bretagne and Bertaèyn, derive from the Latin Britannia, which means "Britons' land". This word had been used by the Romans since the 1st century to refer to Great Britain, more the Roman province of Britain; this word derives from a Greek word, Πρεττανικη or Βρεττανίαι, used by Pytheas, an explorer from Massalia who visited the British Islands around 320 BC.
The Greek word itself comes from the common Brythonic ethnonym reconstructed as *Pritanī, itself from Proto-Celtic *kʷritanoi. The Romans called Brittany Armorica, together with a quite indefinite region that extended along the English Channel coast from the Seine estuary to the Loire estuary, according to several sources, maybe along the Atlantic coast to the Garonne estuary; this term comes from a Gallic word, which means "close to the sea". Another name, was used until the 12th century, it means "wide and flat" or "to expand" and it gave the Welsh name for Brittany: Llydaw. After the fall of the Western Roman Empire, many Britons settled in western Armorica, the region started to be called Britannia, although this name only replaced Armorica in the sixth century or by the end of the fifth. Authors like Geoffrey of Monmouth used the terms Britannia minor and Britannia major to distinguish Brittany from Britain. Breton-speaking people may pronounce the word Breizh in two different ways, according to their region of origin.
Breton can be divided into the dialect of Vannes. KLT speakers pronounce it and would write it Breiz, while the Vannetais speakers pronounce it and would write it Breih; the official spelling is a compromise with a z and an h together. In 1941, efforts to unify the dialects led to the creation of the so-called Breton zh, a standard which has never been accepted. On its side, Gallo language has never had a accepted writing system and several ones coexist. For instance, the name of the region in that language can be written Bertaèyn in ELG script, or Bertègn in MOGA, a couple of other scripts exist. Brittany has been inhabited by humans since the Lower Paleolithic; the first settlers were Neanderthals. This population was scarce and similar to the other Neanderthals found in the whole of Western Europe, their only original feature was a distinct culture, called "Colombanian". One of the oldest hearths in the world has been found in Finistère, it is 450,000 years old. Homo sapiens settled in Brittany around 35,000 years ago.
They replaced or absorbed the Neanderthals and developed local industries, similar to the Châtelperronian or to the Magdalenian. After the last glacial period, the warmer climate allowed the area to become wooded. At that time, Brittany was populated by large communities who started to change their lifestyles from a life of hunting and gathering, to become settled farmers. Agriculture was introduced during the 5th millennium BC by migrants from the east. However, the Neolithic Revolution in Brittany did not happen due to a radical change of population, but by slow immigration and exchange of skills. Neolithic Brittany is characterised by important megalithic production, it is sometimes designated as the "core area" of megalithic culture; the oldest monuments, were followed by princely tombs and stone rows. The Morbihan département, on the southern coast, comprises a large share of these structures, including the Carnac stones and the Broken Menhir of Er Grah in the Locmariaquer megaliths, the largest single stone erected by Neoli
The Vilaine is a river in Brittany, in the west of France. The river's source is in the Mayenne département, it flows out into the Atlantic Ocean at Pénestin in the Morbihan département, it is 218 km long. The river passes through 4 main towns. Three barrages were built around Vitré, Ille-et-Vilaine to alleviate flooding, while securing potable water supplies, they are amenities for recreational activities. 1978 Valière barrage 1982 Haute-Vilaine barrage 1995 Villaumur barrage The river has a flow ranging between 2 and 1500 m3/s The Vilaine is part of Brittany's canal system, built in the 19th century for small barges. The entire system was transferred to the Brittany Region in 2011. In Rennes the river connects to the Canal d'Ille et Rance hence the Rance estuary, which enters the English Channel at Saint-Malo. In Redon it crosses the Canal de Nantes à Brest, giving access to the Blavet and Nantes. Ille Meu Seiche Semnon Chère Don Oust Isac http://www.geoportail.fr River Vilaine navigation guide.
Morbihan is a department in Brittany, situated in the northwest of France. It is named after the Morbihan, the enclosed sea, the principal feature of the coastline, it is noted for its Carnac stones. These predate and are more extensive than the ancient Stonehenge monument in Wiltshire, England, more familiar to English speakers. Three major military educational facilities are located in Guer, including École Spéciale Militaire de Saint-Cyr, the national military academy for officers. Morbihan is one of the original 83 departments created on March 4, 1790 during the French Revolution, it was created from a part of the Duchy of Brittany. In 1945 cadets from École Spéciale Militaire de Saint-Cyr, France's foremost military academy for officers, were relocated to Camp Coëtquidan in Guer; this has been developed to include the École militaire interarmes, for non-commissioned officers. Morbihan is part of the region of Brittany; the Gulf of Morbihan has many islands: 365 according to legend. There are between 30 and 40, depending on how they are counted.
There are many islets that are too small for any development. Of these islands, all but two are owned: l'Île-aux-Moines and l'Île-d'Arz. Owners of the others include movie stars, fashion designers, other wealthy "glitterati". In the department of Morbihan, but outside the Gulf, there are four inhabited islands: Belle Île Groix Houat HoëdicMeaban, an island just outside the Port du Crouesty, is an ornithological reserve. Visitors are forbidden there; the largest towns in Morbihan are Lorient. Many residents support maintenance and use of the Breton language, there are numerous advocates of bilingual education; the painter Raymond Wintz depicted locations around the Gulf of Morbihan. As of 2014, the préfet of Morbihan is Jean-François Savy head of the Prefectures of Ardennes and of Hautes-Alpes; the Carnac stones, megalithic alignments of Carnac, are situated in Morbihan. Tourism office of Auray Cantons of the Morbihan department Communes of the Morbihan department Arrondissements of the Morbihan department La Baule - Guérande Peninsula Prefecture website General Council website Morbihan at Curlie Cultural Heritage Tourism website Hiking in Morbihan
France the French Republic, is a country whose territory consists of metropolitan France in Western Europe and several overseas regions and territories. The metropolitan area of France extends from the Mediterranean Sea to the English Channel and the North Sea, from the Rhine to the Atlantic Ocean, it is bordered by Belgium and Germany to the northeast and Italy to the east, Andorra and Spain to the south. The overseas territories include French Guiana in South America and several islands in the Atlantic and Indian oceans; the country's 18 integral regions span a combined area of 643,801 square kilometres and a total population of 67.3 million. France, a sovereign state, is a unitary semi-presidential republic with its capital in Paris, the country's largest city and main cultural and commercial centre. Other major urban areas include Lyon, Toulouse, Bordeaux and Nice. During the Iron Age, what is now metropolitan France was inhabited by a Celtic people. Rome annexed the area in 51 BC, holding it until the arrival of Germanic Franks in 476, who formed the Kingdom of Francia.
The Treaty of Verdun of 843 partitioned Francia into Middle Francia and West Francia. West Francia which became the Kingdom of France in 987 emerged as a major European power in the Late Middle Ages following its victory in the Hundred Years' War. During the Renaissance, French culture flourished and a global colonial empire was established, which by the 20th century would become the second largest in the world; the 16th century was dominated by religious civil wars between Protestants. France became Europe's dominant cultural and military power in the 17th century under Louis XIV. In the late 18th century, the French Revolution overthrew the absolute monarchy, established one of modern history's earliest republics, saw the drafting of the Declaration of the Rights of Man and of the Citizen, which expresses the nation's ideals to this day. In the 19th century, Napoleon established the First French Empire, his subsequent Napoleonic Wars shaped the course of continental Europe. Following the collapse of the Empire, France endured a tumultuous succession of governments culminating with the establishment of the French Third Republic in 1870.
France was a major participant in World War I, from which it emerged victorious, was one of the Allies in World War II, but came under occupation by the Axis powers in 1940. Following liberation in 1944, a Fourth Republic was established and dissolved in the course of the Algerian War; the Fifth Republic, led by Charles de Gaulle, remains today. Algeria and nearly all the other colonies became independent in the 1960s and retained close economic and military connections with France. France has long been a global centre of art and philosophy, it hosts the world's fourth-largest number of UNESCO World Heritage Sites and is the leading tourist destination, receiving around 83 million foreign visitors annually. France is a developed country with the world's sixth-largest economy by nominal GDP, tenth-largest by purchasing power parity. In terms of aggregate household wealth, it ranks fourth in the world. France performs well in international rankings of education, health care, life expectancy, human development.
France is considered a great power in global affairs, being one of the five permanent members of the United Nations Security Council with the power to veto and an official nuclear-weapon state. It is a leading member state of the European Union and the Eurozone, a member of the Group of 7, North Atlantic Treaty Organization, Organisation for Economic Co-operation and Development, the World Trade Organization, La Francophonie. Applied to the whole Frankish Empire, the name "France" comes from the Latin "Francia", or "country of the Franks". Modern France is still named today "Francia" in Italian and Spanish, "Frankreich" in German and "Frankrijk" in Dutch, all of which have more or less the same historical meaning. There are various theories as to the origin of the name Frank. Following the precedents of Edward Gibbon and Jacob Grimm, the name of the Franks has been linked with the word frank in English, it has been suggested that the meaning of "free" was adopted because, after the conquest of Gaul, only Franks were free of taxation.
Another theory is that it is derived from the Proto-Germanic word frankon, which translates as javelin or lance as the throwing axe of the Franks was known as a francisca. However, it has been determined that these weapons were named because of their use by the Franks, not the other way around; the oldest traces of human life in what is now France date from 1.8 million years ago. Over the ensuing millennia, Humans were confronted by a harsh and variable climate, marked by several glacial eras. Early hominids led a nomadic hunter-gatherer life. France has a large number of decorated caves from the upper Palaeolithic era, including one of the most famous and best preserved, Lascaux. At the end of the last glacial period, the climate became milder. After strong demographic and agricultural development between the 4th and 3rd millennia, metallurgy appeared at the end of the 3rd millennium working gold and bronze, iron. France has numerous megalithic sites from the Neolithic period, including the exceptiona
Oust is a commune in the Ariège department in southwestern France. Inhabitants of Oust are called Oustois; the Château de Mirabat, a medieval castle, known to be in ruins in the 14th century, is in the communes of Seix and Ustou. Communes of the Ariège department INSEE