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Blind Valley
A steephead valley, steephead or blind valley is a deep, narrow, flat bottomed valley with an abrupt ending. Such closed valleys may arise in limestone or karst landscapes, where a layer of permeable rock lies above an impermeable substract such as marl. Water flowing through a steephead valley leaves via one or more ponors or sinkholes. Blind valleys are typically dry at their lower ends. If the ponor cannot contain the high runoff during a flood event an intermittent flow may continue through the valley beyond the sink. Such a landform is called a semi-blind or half-blind valley. Development They are created by a stream flowing within the permeable rock and eroding it from within, until the rock above collapses opening up a steep narrow valley which is then further eroded by the stream running across the impermeable valley floor. At the head of the valley the stream emerges from the rock as a spring. Notable examples can be found in the Jura region of France, for example ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Les Planches-près-Arbois
Les Planches-près-Arbois (, literally ''Les Planches near Arbois'') is a commune in the Jura department in Bourgogne-Franche-Comté in eastern France. Population Geography The village is located in the Reculée des Planches, a gorge which is home to a series of impressive caves and ends in abrupt, limestone cliffs and scree slopes, making it one of the Jura's most prized natural sites. The whole of the gorge is a protected, natural area and also a Natura 2000 site. The landscapes and the viewpoints are protected. This protection strictly limits any expansion of the village but seems to correspond to the current inhabitants' desire to treasure their shared heritage. See also *Communes of the Jura department The following is a list of the 494 communes of the Jura department of France. The communes cooperate in the following intercommunalities (as of 2020): [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canyons And Gorges
A canyon (from ; archaic British English spelling: ''cañon''), or gorge, is a deep cleft between escarpments or cliffs resulting from weathering and the erosive activity of a river over geologic time scales. Rivers have a natural tendency to cut through underlying surfaces, eventually wearing away rock layers as sediments are removed downstream. A river bed will gradually reach a baseline elevation, which is the same elevation as the body of water into which the river drains. The processes of weathering and erosion will form canyons when the river's headwaters and estuary are at significantly different elevations, particularly through regions where softer rock layers are intermingled with harder layers more resistant to weathering. A canyon may also refer to a rift between two mountain peaks, such as those in ranges including the Rocky Mountains, the Alps, the Himalayas or the Andes. Usually, a river or stream carves out such splits between mountains. Examples of mountain-type c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Box Canyon
A canyon (from ; archaic British English spelling: ''cañon''), or gorge, is a deep cleft between escarpments or cliffs resulting from weathering and the erosive activity of a river over geologic time scales. Rivers have a natural tendency to cut through underlying surfaces, eventually wearing away rock layers as sediments are removed downstream. A river bed will gradually reach a baseline elevation, which is the same elevation as the body of water into which the river drains. The processes of weathering and erosion will form canyons when the river's headwaters and estuary are at significantly different elevations, particularly through regions where softer rock layers are intermingled with harder layers more resistant to weathering. A canyon may also refer to a rift between two mountain peaks, such as those in ranges including the Rocky Mountains, the Alps, the Himalayas or the Andes. Usually, a river or stream carves out such splits between mountains. Examples of mountain-type c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gara Medouar
Gara Medouar, also known as Jebel Mudawwar ("round mountain"), Gara Mdouar or Mdoura, is a horseshoe-shaped geological formation (" erosion cirque") near Sijilmasa, Morocco. In the 11th century it was developed into a fortress with a military garrison that likely protected the nearby trade city of Sijilmasa, where gold coins were minted, and the trade routes from the south. Representatives of the Almoravid dynasty likely had the fortifications built, which included a wall of up to 12 metres high that closed off the only opening to the massif, two walls and defensive structures along the mountains, dams in the canyons to collect water, and a variety of structures on the plateaus. The massif was studied by Moroccan sociologist Paul Pascon. Starting with the 1999 film '' The Mummy'', it has also been used as a filming location, and has become a tourist attraction especially for off-roaders. Description and location Gara Medouar is located to the west of the principal tell of Sij ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tasghîmût
''Tasghîmût'' (also Tashgimut, Tashgimout) is a medieval fortress near Marrakesh, Morocco, built on a rocky plateau (an " erosion cirque") and fortified by the Almoravids under Ali ibn Yusuf in the 12th century to protect the nearby capital of Aghmat when the Almohads were making inroads in the western Maghreb. The fortress was conquered by the Almohads in 1132. Some archeological excavations were carried out in the 20th century, but many of the remains of the fortifications have been used for local building projects. Location and history Tasghîmût is about south-east of Marrakesh. At one time it dominated the ancient capital of Aghmat. The site, which also has evidence of Neolithic occupation, resembles Jebel Mudawwar, as an oval, rocky plateau cut through by ravines, overlooking a surrounding plain. Like Jebel Mudawwar it has defensive lines that follow the topography, as well as dams, and one of its inhabited areas is singled out for a privileged occupant. The fortif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Driftless Area
The Driftless Area, a topographical and cultural region in the American Midwest, comprises southwestern Wisconsin, southeastern Minnesota, northeastern Iowa, and the extreme northwestern corner of Illinois. Never covered by ice during the last ice age, the area lacks the characteristic glacial deposits known as drift. Its landscape is characterized by steep hills, forested ridges, deeply carved river valleys, and karst geology with spring-fed waterfalls and cold-water trout streams. Ecologically, the Driftless Area's flora and fauna are more closely related to those of the Great Lakes region and New England than those of the broader Midwest and central Plains regions. The steep riverine landscape of both the Driftless Area proper and the surrounding Driftless-like region are the result of early glacial advances that forced preglacial rivers that flowed into the Great Lakes southward, causing them to carve a gorge across bedrock cuestas, thereby forming the modern incised upper Mi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North America
North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Caribbean Sea, and to the west and south by the Pacific Ocean. Because it is on the North American Plate, North American Tectonic Plate, Greenland is included as a part of North America geographically. North America covers an area of about , about 16.5% of Earth's land area and about 4.8% of its total surface. North America is the third-largest continent by area, following Asia and Africa, and the list of continents and continental subregions by population, fourth by population after Asia, Africa, and Europe. In 2013, its population was estimated at nearly 579 million people in List of sovereign states and dependent territories in North America, 23 independent states, or about 7.5% of the world's population. In Americas (terminology)#Human ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arbois
Arbois () is a Commune in France, commune in the Jura (département), Jura Departments of France, department, in the Bourgogne-Franche-Comté Regions of France, region, eastern France. The river Cuisance passes through the town, which centres on an arcaded central square where one can sample the local wines. The commune has been awarded two flowers by the National Council of Towns and Villages in Bloom in the Competition of cities and villages in Bloom. Geography Arbois is located some 40 km southwest of Besançon and 30 km southeast of Dole, Jura, Dole. It has a typical ''Revermont'' landscape. The plain is mainly used for cropping of cereals on medium-sized plots of land. The lower slopes consist mainly of meadows surrounded by small hedges for dairy farming. There are some vineyards in the same area. The rest of the hills is occupied by small vineyards with a few scattered meadows. The top of the hills and the plateau are heavily forested. Communication and trans ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baume-les-Messieurs
Baume-les-Messieurs () is a commune in the Jura department in the region of Bourgogne-Franche-Comté in eastern France. The village lies within the most extensive of the steephead valleys of the Jura escarpment, the ''Reculée de Baume''. It is therefore almost surrounded by limestone cliffs about 200m high. One of the source rivers of the Seille, the Seille de Baume, has its source within the Reculée and flows through the village. A short tributary of the Seille de Baume, the Dard, merges with the Seille at Baume; at the source of the Dard, also within the Reculée, there is a notable series of caves. The village is dominated by the former Baume Abbey, and in consequence has a significant tourist trade, though this mainly involves day visitors. Conducted tours both of the abbey and of the Dard caves are offered. The GR 59 long-distance footpath passes through the village. Population See also *Baume Abbey *Communes of the Jura department The following is a list o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valley
A valley is an elongated low area often running between Hill, hills or Mountain, mountains, which will typically contain a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams over a very long period. Some valleys are formed through erosion by glacier, glacial ice. These glaciers may remain present in valleys in high mountains or polar areas. At lower latitudes and altitudes, these glaciation, glacially formed valleys may have been created or enlarged during ice ages but now are ice-free and occupied by streams or rivers. In desert areas, valleys may be entirely dry or carry a watercourse only rarely. In karst, areas of limestone bedrock, dry valleys may also result from drainage now taking place cave, underground rather than at the surface. Rift valleys arise principally from tectonics, earth movements, rather than erosion. Many different types of valleys are described by geographers, using terms th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
France
France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pacific and Indian Oceans. Its Metropolitan France, metropolitan area extends from the Rhine to the Atlantic Ocean and from the Mediterranean Sea to the English Channel and the North Sea; overseas territories include French Guiana in South America, Saint Pierre and Miquelon in the North Atlantic, the French West Indies, and many islands in Oceania and the Indian Ocean. Due to its several coastal territories, France has the largest exclusive economic zone in the world. France borders Belgium, Luxembourg, Germany, Switzerland, Monaco, Italy, Andorra, and Spain in continental Europe, as well as the Kingdom of the Netherlands, Netherlands, Suriname, and Brazil in the Americas via its overseas territories in French Guiana and Saint Martin (island), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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