Dranse (Haute-Savoie)
The Dranse () is a French river in the department of Haute-Savoie, that empties into Lake Geneva between Thonon-les-Bains and Évian-les-Bains. The name " Dranse" comes from the former ''Drantia'', based on the hydronym '' dur-, dora'' and the suffix ''-antia''. Geography The Dranse is formed from the combination of three mountain rivers originating from the peaks of the upper Chablais Alps, which converge upstream from the delta: * To the east, the Dranse d'Abondance irrigates the Val d'Abondance and passes through the communes of Abondance and Châtel; * To the south, the Dranse de Morzine passes through Morzine, Saint-Jean-d'Aulps and the Gorges du Pont-du-Diable; * To the west, the Brevon, also called the Dranse de Bellevaux, originates from Roc d'Enfer and passes through Lac de Vallon and the villages of Bellevaux, Vailly and Reyvroz. The Dranse d'Abondance is considered the higher-ordered stream of the Dranse. The Dranse de Morzine is consequently considered ...
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Lake Geneva
Lake Geneva is a deep lake on the north side of the Alps, shared between Switzerland and France. It is one of the List of largest lakes of Europe, largest lakes in Western Europe and the largest on the course of the Rhône. Sixty percent () of the lake belongs to Switzerland (the cantons of Vaud, Canton of Geneva, Geneva and Valais) and forty percent () to France (the department of Haute-Savoie). Name While the exact origins of the name are unknown, the name was in use during the time of Julius Caesar. comes from Ancient Greek () meaning "port's lake". In Medieval Latin it was known as , although this name was also used for Lausonius Lacus, a town or district on the lake, or ; the equivalent in Old French was . Following the rise of Geneva it became (translated into English as ''Lake Geneva''), but was the common name on all local maps and is the customary name in the French language. In contemporary English language, English, the name ''Lake Geneva'' has become predo ...
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Saint-Jean-d'Aulps
Saint-Jean-d'Aulps (; ) is a commune in the Haute-Savoie department in the Auvergne-Rhône-Alpes region in south-eastern France. Situated in the heart of the Vallée d'Aulps, as well as being the home to an active farming community, it is popular with holiday-makers in the Summer, for walking, and in the Winter for skiing as it is a part of the massive Portes du Soleil ski area. The inhabitants are called (in French) the "Jovanétiens". The commune is spread over and has 1,558 inhabitants (2019), 6,900 beds for tourists, 464 main residences, and 1,358 secondary residences. The population density is 39 inhabitants/km2 (2019). Saint-Jean-d'Aulps is surrounded by the communes of Seytroux, Le Biot, Abondance, Essert Romand and Bellevaux. The closest town is Thonon les Bains away. The river "la Dranse de Morzine" is the main water course through the village. In the commune, at an altitude of , is the ski-area "l'Espace Roc d'Enfer". One can ski between above sea level and offer ...
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Whitewater Kayaking
Whitewater kayaking is an outdoor adventure sport where paddlers navigate a river in a specially designed kayak. Whitewater kayaking includes several styles: river running, creeking, slalom, playboating, and squirt boating. Each style offers a different way to experience the thrill and beauty of whitewater environments. Various techniques help paddlers navigate rivers, such as paddle strokes (such as ready position, forward stroke, back stroke, low brace, high brace, forward sweep, back sweep, and duffek/bow rudder), rolling, and boofing. Whitewater kayaking requires much essential equipment to make a “kayaking kit,” such as a whitewater-specific kayak, spray skirt, paddle, helmet, and PFD (personal flotation device). Paddling on rivers, lakes, and oceans dates back to the Stone Age, with rafts, catamarans, canoes, and kayaks evolving based on the needs of indigenous peoples. After his North American travels, John MacGregor popularized kayaking in Europe in the 19th centu ...
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Biodiversity
Biodiversity is the variability of life, life on Earth. It can be measured on various levels. There is for example genetic variability, species diversity, ecosystem diversity and Phylogenetics, phylogenetic diversity. Diversity is not distributed evenly on Earth. It is greater in the tropics as a result of the warm climate and high primary productivity in the region near the equator. Tropical forest ecosystems cover less than one-fifth of Earth's terrestrial area and contain about 50% of the world's species. There are latitudinal gradients in species diversity for both marine and terrestrial taxa. Since Abiogenesis, life began on Earth, six major mass extinctions and several minor events have led to large and sudden drops in biodiversity. The Phanerozoic aeon (the last 540 million years) marked a rapid growth in biodiversity via the Cambrian explosion. In this period, the majority of Multicellular organism, multicellular Phylum, phyla first appeared. The next 400 mil ...
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Delta De La Dranse National Nature Reserve
The Delta de la Dranse National Nature Reserve is a nature reserve located in the delta of the Dranse river. The reserve is located to the east of the commune of Thonon-les-Bains in southeastern France. At long by wide, it covers a small area of at an elevation ranging from . Offering a rich botanic biodiversity, the site was declared a national nature reserve in January 1980 Décret ministériel n° 80–97 du 17 janvier 1980 portant création de la réserve naturelle du delta de la Dranse and declared a special "zone of protection" since September 1986. The beach of the last river delta along Lake Geneva is constituted of alluvium, sand, stones, and pebbles. The sandy beaches and small islands are constantly being formed by the path of the rising torrential river, which has resulted in the expansion of a rich diversity of flora and wildlife. The reserve shelters: * Close to 750 plant species including orchids; * More than 200 species of birds, notably the red-crested poc ...
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Sandre
Sandre stands for ''Service d’administration nationale des données et des référentiels sur l’eau'', or National Service for Water Data and Common Repositories Management of France. The Sandre service establishes the common water data language of the French national Water Information System (SIE: ''Système d’information sur l’eau''). Sandre is a division of the National Agency of Water and Aquatic Environments (Onema: ''Office national de l’eau et des milieux aquatiques''). Its technical secretariat is entrusted to the International Office for Water (OIE: ''Office International de l’Eau''). Missions The Sandre is in charge of describing water data and defining technical scenarios to allow data interchange between producers, users and databanks. These data are based on reference datasets (code lists) managed by the Sandre. Services The Sandre makes available specification documents (1) free of charge for water data interchanges. It maintains a permanent helpdesk ...
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Tributary
A tributary, or an ''affluent'', is a stream or river that flows into a larger stream (''main stem'' or ''"parent"''), river, or a lake. A tributary does not flow directly into a sea or ocean. Tributaries, and the main stem river into which they flow, drain the surrounding drainage basin of its surface water and groundwater, leading the water out into an ocean, another river, or into an endorheic basin. The Irtysh is a chief tributary of the Ob (river), Ob river and is also the longest tributary river in the world with a length of . The Madeira River is the largest tributary river by volume in the world with an average discharge of . A confluence, where two or more bodies of water meet, usually refers to the joining of tributaries. The opposite to a tributary is a distributary, a river or stream that branches off from and flows away from the main stream.
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Strahler Stream Order
In mathematics, the Strahler number or Horton–Strahler number of a mathematical tree is a numerical measure of its branching complexity. These numbers were first developed in hydrology, as a way of measuring the complexity of rivers and streams, by and . In this application, they are referred to as the Strahler stream order and are used to define stream size based on a hierarchy of tributaries. The same numbers also arise in the analysis of L-systems and of hierarchical biological structures such as (biological) trees and animal respiratory and circulatory systems, in register allocation for compilation of high-level programming languages and in the analysis of social networks. Definition All trees in this context are directed graphs, oriented from the root towards the leaves; in other words, they are arborescences. The degree of a node in a tree is just its number of children. One may assign a Strahler number to all nodes of a tree, in bottom-up order, as follows: *If the ...
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Reyvroz
Reyvroz (; ) is a commune in the Haute-Savoie department in the Auvergne-Rhône-Alpes region in south-eastern France. See also *Communes of the Haute-Savoie department The following is a list of the 279 Communes of France, communes of the French Departments of France, department of Haute-Savoie. The communes cooperate in the following Communes of France#Intercommunality, intercommunalities (as of 2025):

Vailly, Haute-Savoie
Vailly (; ) is a commune in the Haute-Savoie department in the Auvergne-Rhône-Alpes region in south-eastern France. See also *Communes of the Haute-Savoie department The following is a list of the 279 Communes of France, communes of the French Departments of France, department of Haute-Savoie. The communes cooperate in the following Communes of France#Intercommunality, intercommunalities (as of 2025):

Bellevaux
Bellevaux (; ) is a commune in the Haute-Savoie department in the Auvergne-Rhône-Alpes region in south-eastern France. See also *Communes of the Haute-Savoie department The following is a list of the 279 Communes of France, communes of the French Departments of France, department of Haute-Savoie. The communes cooperate in the following Communes of France#Intercommunality, intercommunalities (as of 2025):

Lac De Vallon
Lac de Vallon is a lake at Bellevaux in the Haute-Savoie department of France France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan .... The lake formed in 1943 when a landslide blocked the course of the Brévon river. Vallon, Lac {{HauteSavoie-geo-stub ...
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