knee (geography)

{{unreferenced, date=July 2015 A knee, or river knee, is a bend in a

river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, 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 wate ...

changing its course greatly, suddenly to a different general direction (in an angle of around 90 degrees). It is different from most (one-off) riverbends, and from a (particular)

meander A meander is one of a series of regular sinuous curves in the channel of a river or other watercourse. It is produced as a watercourse erodes the sediments of an outer, concave bank ( cut bank) and deposits sediments on an inner, convex bank ...

which connotes one of several bends in a sinuous course, without changing the general direction. Knees navigable by large vessels or set in upland areas or arid

drainage basin A drainage basin is an area of land where all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, t ...

s were similar to major

confluence In geography, a confluence (also: ''conflux'') occurs where two or more flowing bodies of water join to form a single channel. A confluence can occur in several configurations: at the point where a tributary joins a larger river (main stem); o ...

s in that they were particularly suitable for trade and defense, and therefore gave rise to forts, governing army camps or cities. Many major world rivers have such a notable knee close to major settled places: * the

Rhine knee The Rhine knee or Rhine's knee (german: Rheinknie) is the name of several distinctive bends in the course of the river Rhine. Basel In Basel, the Rhine changes its westerly direction of flow in an angle of 90 degrees to a northerly direction, alo ...

Basel , french: link=no, Bâlois(e), it, Basilese , neighboring_municipalities= Allschwil (BL), Hégenheim (FR-68), Binningen (BL), Birsfelden (BL), Bottmingen (BL), Huningue (FR-68), Münchenstein (BL), Muttenz (BL), Reinach (BL), Riehen (BS ...

Switzerland ). Swiss law does not designate a ''capital'' as such, but the federal parliament and government are installed in Bern, while other federal institutions, such as the federal courts, are in other cities (Bellinzona, Lausanne, Luzern, Neuchâtel ...

is the river's greatest knee – others are in German cities

Wiesbaden Wiesbaden () is a city in central western Germany and the capital of the state of Hesse. , it had 290,955 inhabitants, plus approximately 21,000 United States citizens (mostly associated with the United States Army). The Wiesbaden urban area ...

and Bingen * the Danube knee in

Vác Vác (; german: Waitzen; sk, Vacov; yi, ווייצען) is a town in Pest county in Hungary with approximately 35,000 inhabitants. The archaic spelling of the name is ''Vácz''. Location Vác is located north of Budapest on the eastern bank o ...

Hungary Hungary ( hu, Magyarország ) is a landlocked country in Central Europe. Spanning of the Carpathian Basin, it is bordered by Slovakia to the north, Ukraine to the northeast, Romania to the east and southeast, Serbia to the south, Croatia a ...

(35 km north of

Budapest Budapest (, ; ) is the capital and most populous city of Hungary. It is the ninth-largest city in the European Union by population within city limits and the second-largest city on the Danube river; the city has an estimated population ...

) * the Volga knee at

Volgograd Volgograd ( rus, Волгогра́д, a=ru-Volgograd.ogg, p=vəɫɡɐˈɡrat), geographical renaming, formerly Tsaritsyn (russian: Цари́цын, Tsarítsyn, label=none; ) (1589–1925), and Stalingrad (russian: Сталингра́д, Stal ...

Russia Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the ...

* the upper Rhône knee at

Martigny Martigny (; german: Martinach, ; la, Octodurum) is the capital city of the district of Martigny, canton of Valais, Switzerland. It lies at an elevation of , and its population is approximately 15000 inhabitants (''Martignerains'' or "Octodurie ...

* the Petitcodiac knee at

Moncton Moncton (; ) is the most populous city in the Provinces and territories of Canada, Canadian province of New Brunswick. Situated in the Petitcodiac River Valley, Moncton lies at the geographic centre of the The Maritimes, Maritime Provinces. The ...

New Brunswick New Brunswick (french: Nouveau-Brunswick, , locally ) is one of the thirteen provinces and territories of Canada. It is one of the three Maritime provinces and one of the four Atlantic provinces. It is the only province with both English and ...

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

, locally known as ''Le Coude'' * The Irawaddy knee at

Mandalay Mandalay ( or ; ) is the second-largest city in Myanmar, after Yangon. Located on the east bank of the Irrawaddy River, 631km (392 miles) (Road Distance) north of Yangon, the city has a population of 1,225,553 (2014 census). Mandalay was fo ...

Some riverbends are in some places referred to "knees" but are bends largely unaffecting the course or a small sharp meander: * the "Vltava knee" in

Prague Prague ( ; cs, Praha ; german: Prag, ; la, Praga) is the capital and largest city in the Czech Republic, and the historical capital of Bohemia. On the Vltava river, Prague is home to about 1.3 million people. The city has a temperate ...

Czech Republic The Czech Republic, or simply Czechia, is a landlocked country in Central Europe. Historically known as Bohemia, it is bordered by Austria to the south, Germany to the west, Poland to the northeast, and Slovakia to the southeast. The ...

* the "Elbe knee" at

Königstein Fortress Königstein Fortress (german: Festung Königstein), the "Saxony, Saxon Bastille", is a hilltop fortress near Dresden, in Saxon Switzerland, Germany, above the town of Königstein, Saxony, Königstein on the left bank of the River Elbe. It is one ...

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

* the "Rhine knee" at

Düsseldorf Düsseldorf ( , , ; often in English sources; Low Franconian and Ripuarian: ''Düsseldörp'' ; archaic nl, Dusseldorp ) is the capital city of North Rhine-Westphalia, the most populous state of Germany. It is the second-largest city in th ...