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Alviela River
Alviela River ( pt, Rio Alviela, ) is a river in Portugal. It is long. The Alviela spring is one of the deepest in the world and is locally connected to a cave complex that represents the most significant fluvio-karstic phenomena in Portugal, one which supports several bat colonies with more than 5,000 bats in total. The river has its origin in a karst spring. Ribeira dos Amiais, a losing stream, infiltrates through the Sumidouro da Ribeira dos Amiais, a ponor, only to return to the surface 250 m further on through a 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 .... Nascente do Alviela.JPG, Ribeira dos Amiais, tributary of Alviela Sumidouro da Ribeira dos Amiais - Portugal (26498565342).jpg, Sumidouro da ribeira dos Amiais, were the water from the stream infiltrates R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alcanena
Alcanena () is a portuguese town and municipality of Ribatejo in Santarém District. The population in 2011 was 13,868, in an area of 127.33 km². The current Mayor is Rui Anastácio (Partido Social Democrata) and the president of the Municipal Assembly is Silvestre Pereira (Socialist Party). The municipal holiday is Ascension Day. Parishes Administratively, the municipality is divided into 7 civil parishes (''freguesias''): * Alcanena e Vila Moreira * Bugalhos * Malhou, Louriceira e Espinheiro * Minde * Moitas Venda * Monsanto * Serra de Santo António Alcanena - Portugal (5979765746).jpg, Serras de Aire e Candeeiros Natural Park as seen from Alcanena Alcanena - Portugal (3324066244).jpg Notable people * Alfredo Roque Gameiro (1864 in Minde - 1935) a painter, specialized in watercolors * Maria da Conceição Moita (1937–2021) an educator and political activist * Carlos Calado (born 1975) a Portuguese long jumper. See also *Casais Robustos Casais Robustos is a s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tagus
The Tagus ( ; es, Tajo ; pt, Tejo ; see below) is the longest river in the Iberian Peninsula. The river rises in the Montes Universales near Teruel, in mid-eastern Spain, flows , generally west with two main south-westward sections, to empty into the Atlantic Ocean in Lisbon. Its drainage basin covers – exceeded in the peninsula only by the Douro. The river is highly used. Several dams and diversions supply drinking water to key population centres of central Spain and Portugal; dozens of hydroelectric stations create power. Between dams it follows a very constricted course, but after Almourol, Portugal it has a wide alluvial valley, prone to flooding. Its mouth is a large estuary culminating at the major port, and Portuguese capital, Lisbon. The source is specifically: in political geography, at the Fuente de García in the Frías de Albarracín municipality; in physical geography, within the notably high range, the Sistema Ibérico (Iberian System), of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vale De Figueira
Vale de Figueira is a former civil parish in the municipality of Santarém, Portugal. In 2013, the parish merged into the new parish São Vicente do Paul e Vale de Figueira. The village has almost 2,000 inhabitants. It is close to Santarém, the capital city of its region, Ribatejo. It sits on a valley, parallel to the ''Bela Vista'' plateau, being famous for the mouth of the river Alviela, a tributary of Tagus river, inserted on the diversity of colours which, all combined, create a picturesque landscape. It is a land of campinos (the regional name given to the cattle herders), horses, bulls and nature that help making Vale de Figueira a unique place in the Ribatejo region. The village is rich in the production of vine and cereals. There is not a consensus, but most believe the origin of the name ''Vale de Figueira'' comes from the no-longer existing coating of fig trees that used to cover the area. Still, its foundation is believed to be from the Roman Empire times and the vi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tagus Basin
The Tagus Basin is the drainage basin of the Tagus River, which flows through the west of the Iberian Peninsula and empties into Lisbon. It covers an area of 78,467 km2, which is distributed 66% (55,645 km2) on Spanish territory and 34% on Portuguese land (22,822 km2). It is the third largest basin in the Iberian Peninsula, after the Douro Basin, with 98,258 km2, and the Ebro Basin, with 82,587 km2. Physical environment The Tagus basin is one of the most important in the Peninsula, due to its extension and its flow, being the one with the highest population density in Spain and the peninsula. It is formed by an elongated surface with an east–west orientation, the Tagus River flows from the Sierra de Albarracín, where it has its source, to the estuary, Mar de la Paja, next to Lisbon, through the center of the Hesperian Massif with a length of 910 km, in the Spanish area, 1092 km in total length. The basin is wedged between the Central System, to the north, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
River
A river is a natural flowing watercourse, usually freshwater Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the term specifically excludes seawater and brackish water, it does include ..., 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 water. Small rivers can be referred to using names such as Stream#Creek, creek, Stream#Brook, brook, rivulet, and rill. There are no official definitions for the generic term river as applied to Geographical feature, 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; examples are "run" in some parts of the United States, "Burn (landform), burn" in Scotland and northeast England, and "be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Portugal
Portugal, officially the Portuguese Republic, In recognized minority languages of Portugal: :* mwl, República Pertuesa is a country located on the Iberian Peninsula, in Southwestern Europe, and whose territory also includes the Macaronesian archipelagos of the Azores and Madeira. It features the westernmost point in continental Europe, its mainland west and south border with the North Atlantic Ocean and in the north and east, the Portugal-Spain border, constitutes the longest uninterrupted border-line in the European Union. Its archipelagos form two autonomous regions with their own regional governments. On the mainland, Alentejo region occupies the biggest area but is one of the least densely populated regions of Europe. Lisbon is the capital and largest city by population, being also the main spot for tourists alongside Porto, the Algarve and Madeira. One of the oldest countries in Europe, its territory has been continuously settled and fought over since prehistoric tim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karst Spring
A karst spring or karstic spring is a spring (outflow of groundwater) that is part of a karst hydrological system. Description Because of their often conical or inverted bowl shape, karst springs are also known in German-speaking lands as a ''Topf'' ("pot") which is reflected in names such as Aachtopf (the source of the Radolfzeller Aach) or Blautopf (the source of the Blau river in Blaubeuren). Karst springs often have a very high yield or discharge rate, because they are often fed by underground drainage from a large catchment basin. Because the springs are usually the terminus of a cave drainage system at the place where a river cave reaches the Earth's surface, it is often possible to enter the caves from karst springs for exploration. Large karst springs are located in many parts of the world; the largest ones are believed to be in Papua New Guinea, with others located in Mediterranean countries such as Bosnia and Herzegovina, Croatia, Turkey, Slovenia, and Italy. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Losing Stream
A losing stream, disappearing stream, influent stream or sinking river is a stream or river that loses water as it flows downstream. The water infiltrates into the ground recharging the local groundwater, because the water table is below the bottom of the stream channel. This is the opposite of a more common ''gaining stream'' (or ''effluent stream'') which increases in water volume farther downstream as it gains water from the local aquifer. Losing streams are common in arid areas due to the climate which results in huge amounts of water evaporating from the river generally towards the mouth. Losing streams are also common in regions of karst topography where the streamwater may be completely captured by a cavern system, becoming a subterranean river. Examples There are many natural examples of subterranean rivers including: Bosnia and Herzegovina * Unac; Mušnica-Trebišnjica- Krupa/Ombla (Trebišnjica is considered to be one of the largest sinking rivers in the world; ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ponor
A ponor is a natural opening where surface water enters into underground passages; they may be found in karst landscapes where the geology and the geomorphology is typically dominated by porous limestone rock. Ponors can drain stream or lake water continuously or can at times work as springs, similar to estavelles. Morphologically, ponors come in forms of large pits and caves, large fissures and caverns, networks of smaller cracks, and sedimentary, alluvial drains. Etymology The name for the karst formation ponor comes from Croatian and Slovene. It derives from the proto-Slavic word ''nora'', meaning ''pit'', ''hole'', ''abyss''; the English word ''narrow'' probably has the same origin. Several places in southeast Europe (Bulgaria, Croatia, Czech Republic, Hungary, Romania, Montenegro, Slovenia) bear the name ''Ponor'' due to associated karst openings. Description Whereas a sinkhole (doline) is a depression of surface topography with a pit or cavity directly underneath, a pon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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