The Sierra de Gredos is a

mountain range A mountain range or hill range is a series of mountains or hills arranged in a line and connected by high ground. A mountain system or mountain belt is a group of mountain ranges with similarity in form, structure, and alignment that have arise ...

in central Spain that spans the provinces of Ávila,

Salamanca Salamanca () is a city in western Spain and is the capital of the Province of Salamanca in the autonomous community of Castile and León. The city lies on several rolling hills by the Tormes River. Its Old City was declared a UNESCO World Herit ...

, Cáceres,

Madrid Madrid ( , ) is the capital and most populous city of Spain. The city has almost 3.4 million inhabitants and a Madrid metropolitan area, metropolitan area population of approximately 6.7 million. It is the Largest cities of the Europ ...

, and Toledo. It is part of the much larger

Sistema Central The Central System, Spanish and pt, Sistema Central, is one of the main systems of mountain ranges in the Iberian Peninsula. The 2,592 m high Pico Almanzor is its highest summit. The Central System is located just north of the 40th parallel a ...

of mountain ranges. Its highest point is Pico Almanzor, at 2,592 metres and it has been declared a natural park by the

Autonomous Community eu, autonomia erkidegoa ca, comunitat autònoma gl, comunidade autónoma oc, comunautat autonòma an, comunidat autonoma ast, comunidá autónoma , alt_name = , map = , category = Autonomous administra ...

of Castile and León. The Sierra de Gredos is one of the most extensive mountain ranges of the Central System; it comprises five river valleys: the Alto Tormes, the Alto Alberche, the Tiétar Oriental, the Tiétar Occidental y la Vera, and the Valle del Ambroz. The first known inhabitants were the

Vettones The Vettones (Greek: ''Ouettones'') were a pre-Roman people of the Iberian Peninsula of possibly Celtic ethnicity. Origins Lujan (2007) concludes that some of the names of the Vettones show clearly western Hispano-Celtic features. Reissued i ...

, a pre-Roman Celtic people. The central part of the range encomprises the Sierra de Gredos Regional Park.

Geology

The Sierra de Gredos comprises mainly

granite Granite () is a coarse-grained ( phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies under ...

, which is a common type of intrusive, felsic, igneous rock which is granular and phaneritic in texture. This rock consists mainly of

quartz Quartz is a hard, crystalline mineral composed of silica ( silicon dioxide). The atoms are linked in a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical ...

, mica, and

feldspar Feldspars are a group of rock-forming aluminium tectosilicate minerals, also containing other cations such as sodium, calcium, potassium, or barium. The most common members of the feldspar group are the ''plagioclase'' (sodium-calcium) felds ...

. In some Gredos rocks the feldspar crystals are especially large, attaining a size of several centimeters in some cases. There is also some

granodiorite Granodiorite () is a coarse-grained ( phaneritic) intrusive igneous rock similar to granite, but containing more plagioclase feldspar than orthoclase feldspar. The term banatite is sometimes used informally for various rocks ranging from gr ...

and outcrops of

metamorphic rocks Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism. The original rock (protolith) is subjected to temperatures greater than and, often, elevated pressure of or more, caus ...

. During a large part of the

Paleozoic Era The Paleozoic (or Palaeozoic) Era is the earliest of three geologic eras of the Phanerozoic Eon. The name ''Paleozoic'' ( ;) was coined by the British geologist Adam Sedgwick in 1838 by combining the Greek words ''palaiós'' (, "old") and ''z ...

, from 600 to 350 million years ago, the whole area was covered by the

Tethys Ocean The Tethys Ocean ( el, Τηθύς ''Tēthús''), also called the Tethys Sea or the Neo-Tethys, was a prehistoric ocean that covered most of the Earth during much of the Mesozoic Era and early Cenozoic Era, located between the ancient continents ...

where horizontal layers or strata of sediments accumulated due to the process of erosion in the unflooded regions. These sediments were fractured and folded due to the actions of the

Variscan Orogeny The Variscan or Hercynian orogeny was a geologic mountain-building event caused by Late Paleozoic continental collision between Euramerica (Laurussia) and Gondwana to form the supercontinent of Pangaea. Nomenclature The name ''Variscan'', comes f ...

and extensive areas emerged from the sea. At the end of the Paleozoic molten

magma Magma () is the molten or semi-molten natural material from which all igneous rocks are formed. Magma is found beneath the surface of the Earth, and evidence of magmatism has also been discovered on other terrestrial planets and some natural sa ...

rose up which turned into granite as it cooled. Erosion continued for a long time until between 40 and 2 million years ago, when another convulsion, known as the Alpine Orogeny, created the mountains that today comprise the Central System. The tectonic style of the Sierra de Gredos is the so-called Germanic style, i.e. with large upraised fault blocks, known as horst, bounded by graben. The Sierra de Gredos is divided into three sectors: the Eastern sector up to the Puerto del Pico fault, the Central sector up to the Puerto de Tornavacas fault, and the Western sector which is the Sierra de Béjar.

Eastern section

Rises in the south near the North Tietar fault. The northern limit of the horst is structured by a system of faults that run to the north-east, such as the Burguillo fault, and also in an east-west direction, like the Navaluenga fault, along which the Alberche river runs. The highest peaks of this sector are the following: * Alto del Mirlo 1.770 m ( Casillas) * La Escusa 1.960 m * Gamonosa 1.993 m ( Casavieja) * Lanchamala 1.999 m ( Piedralaves) * El Torozo 2.025 m * Risco de Miravalles 2.010 m ( Gavilanes) * Risco del Artuñero 2.011 m * Cabezo de Gavilanes 2.190 m ( Gavilanes) Sierra-gredos-cara sur-300110

Lakes

* Laguna Grande de Gredos * Las Cinco Lagunas * Laguna del Barco * Laguna de los Caballeros * Laguna de la Nava * Lagunas del Trampal * Laguna del Duque

Fauna

The main species to be found in the Sierra de Gredos are the following: * The Iberian ibex (''Capra pyrenaica'') * The

roe deer The roe deer (''Capreolus capreolus''), also known as the roe, western roe deer, or European roe, is a species of deer. The male of the species is sometimes referred to as a roebuck. The roe is a small deer, reddish and grey-brown, and well-adapt ...

(''Capreolus capreolus'') * The red-legged partridge (''Alectoris rufa'') * The

golden eagle The golden eagle (''Aquila chrysaetos'') is a bird of prey living in the Northern Hemisphere. It is the most widely distributed species of eagle. Like all eagles, it belongs to the family Accipitridae. They are one of the best-known birds of ...

(''Aquila chrysaetos'') * The

Spanish imperial eagle The Spanish imperial eagle (''Aquila adalberti''), also known as the Spanish eagle or Adalbert's eagle, is a species of eagle native to the Iberian Peninsula. The binomial commemorates Prince Adalbert of Bavaria. Due to its distinct “epaule ...

(''Aquila adalberti'') * The

European honey buzzard The European honey buzzard (''Pernis apivorus''), also known as the pern or common pern, is a bird of prey in the family Accipitridae. Etymology Despite its English name, this species is more closely related to kites of the genera '' Leptodon'' a ...

(''Pernis apivorus'') * The

cinereous vulture The cinereous vulture (''Aegypius monachus'') is a large raptor in the family Accipitridae and distributed through much of temperate Eurasia. It is also known as the black vulture, monk vulture and Eurasian black vulture. With a body length of , ...

(''Aegypius monachus'') * The

griffon vulture The Eurasian griffon vulture (''Gyps fulvus'') is a large Old World vulture in the bird of prey family Accipitridae. It may also be known as the Griffon vulture, though it may be used for the genus as a whole. It is not to be confused with Rü ...

(''Gyps fulvus'')

Endemic species

* The

common toad The common toad, European toad, or in Anglophone parts of Europe, simply the toad (''Bufo bufo'', from Latin ''bufo'' "toad"), is a frog found throughout most of Europe (with the exception of Ireland, Iceland, and some Mediterranean islands), in ...

of Gredos (''Bufo bufo gredosicola'') * The fire salamander of Almanzor (''Salamandra salamandra almanzoris'') * The European snow vole of Avila (''Microtus nivalis abulensis'') * The western Spanish ibex (''Capra pyrenaica victoriae'') * The lagartija carpetana (''

Iberolacerta cyreni ''Iberolacerta cyreni'', commonly known as the Cyren's rock lizard, is a species of lizard in the family Lacertidae. The species is endemic to central Spain and is currently listed as endangered by the IUCN due to global warming. ''I. cyreni'' ...

''), a species of lizard

Flora

The variety of plant life in the Sierra de Gredos is closely related to the altitude at which it is found. In ascending order, the following species of trees can be found: holm oak (or holly oak), chestnut,

alder Alders are trees comprising the genus ''Alnus'' in the birch family Betulaceae. The genus comprises about 35 species of monoecious trees and shrubs, a few reaching a large size, distributed throughout the north temperate zone with a few sp ...

, rowan (or mountain ash),

birch A birch is a thin-leaved deciduous hardwood tree of the genus ''Betula'' (), in the family Betulaceae, which also includes alders, hazels, and hornbeams. It is closely related to the beech- oak family Fagaceae. The genus ''Betula'' contains ...

aspen Aspen is a common name for certain tree species; some, but not all, are classified by botanists in the section ''Populus'', of the '' Populus'' genus. Species These species are called aspens: *'' Populus adenopoda'' – Chinese aspen (Chin ...

willow Willows, also called sallows and osiers, from the genus ''Salix'', comprise around 400 speciesMabberley, D.J. 1997. The Plant Book, Cambridge University Press #2: Cambridge. of typically deciduous trees and shrubs, found primarily on moist so ...

, Pyrenean oak, replaced in some areas by

pine A pine is any conifer tree or shrub in the genus ''Pinus'' () of the family Pinaceae. ''Pinus'' is the sole genus in the subfamily Pinoideae. The World Flora Online created by the Royal Botanic Gardens, Kew and Missouri Botanical Garden accepts ...

. At higher altitudes there are mostly bushes of the genus ''

Cytisus ''Cytisus'' is a genus of flowering plants in the family Fabaceae, native to open sites (typically scrub and heathland) in Europe, western Asia and North Africa. It belongs to the subfamily Faboideae, and is one of several genera in the tribe Ge ...

'' (brooms), juniper and several species of

camomile Chamomile (American English) or camomile (British English; see spelling differences) ( or ) is the common name for several plants of the family Asteraceae. Two of the species, ''Matricaria recutita'' and ''Anthemis nobilis'', are commonly us ...