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60-640: The basin is bounded on the east of the Rhine in the northeast and east by the slopes of the Westerwald and, on the west of the Rhine, from north to southwest by the Eifel mountains, and in the southeast by the valley of the Moselle above Moselkern . Its mild winters and dry climate enable intensive agriculture, which is why the landscape has few woods. The Handbook of Natural Region Divisions of Germany groups

120-544: A humid continental climate (Köppen climate classification: Dfb ). In the lowlands of the Unterwesterwald (Lower Westerwald), summers tend to be warm to hot. Erratic convective downpours are not uncommon, yet mostly brief. Winters are mild and see a lot of precipitation, which mostly falls as rain. Snowfall occurs multiple times a year, but usually melts within hours. Thermophilic fruits like figs and peaches are hardy in this area. The mountainous areas of

180-682: A basalt-rich region. Wäller is another vernacular name for them. One of the 12 best-rated hiking trails in Germany is the Westerwaldsteig. The Westerwaldsteig crosses the Westerwald from east ( Herborn ) to west ( Rhine ). Clay Clay is a type of fine-grained natural soil material containing clay minerals (hydrous aluminium phyllosilicates, e.g. kaolinite , Al 2 Si 2 O 5 ( OH ) 4 ). Most pure clay minerals are white or light-coloured, but natural clays show

240-575: A gel of orthosilicic acid ).) The clay minerals formed depend on the composition of the source rock and the climate. Acid weathering of feldspar -rich rock, such as granite , in warm climates tends to produce kaolin. Weathering of the same kind of rock under alkaline conditions produces illite . Smectite forms by weathering of igneous rock under alkaline conditions, while gibbsite forms by intense weathering of other clay minerals. There are two types of clay deposits: primary and secondary. Primary clays form as residual deposits in soil and remain at

300-836: A great capacity to take up water, and they increase greatly in volume when they do so. When dried, they shrink back to their original volume. This produces distinctive textures, such as mudcracks or "popcorn" texture, in clay deposits. Soils containing swelling clay minerals (such as bentonite ) pose a considerable challenge for civil engineering, because swelling clay can break foundations of buildings and ruin road beds. Clay minerals most commonly form by prolonged chemical weathering of silicate-bearing rocks. They can also form locally from hydrothermal activity. Chemical weathering takes place largely by acid hydrolysis due to low concentrations of carbonic acid , dissolved in rainwater or released by plant roots. The acid breaks bonds between aluminium and oxygen, releasing other metal ions and silica (as

360-402: A major challenge in civil engineering . The defining mechanical property of clay is its plasticity when wet and its ability to harden when dried or fired. Clays show a broad range of water content within which they are highly plastic, from a minimum water content (called the plastic limit ) where the clay is just moist enough to mould, to a maximum water content (called the liquid limit) where

420-535: A range of handcrafted utility ware, with hand-painted swirling floral motifs. In the eastern Westerwald (the part lying in Hesse) are found interesting limestone deposits from the most varied of geological times. Erdbach limestone from the Lower Carboniferous gave one small time period the name "Erdbachian". Near Breitscheid are found the remnants of an atoll from the subtropical Devonian sea that

480-588: A strip of land on the Rhine's right bank and the so-called Rhine-Westerwald; the Westerwald itself lay outside the Roman-occupied area, for the Romans preferred to maintain a little-settled, most likely pathless wilderness as their border. The Westerwald's permanent settlement and thereby its territorial history began with the Chatti (Hessians) pushing their way into the area after the Romans were driven out in

540-437: A variety of colours from impurities, such as a reddish or brownish colour from small amounts of iron oxide . Clays develop plasticity when wet but can be hardened through firing . Clay is the longest-known ceramic material. Prehistoric humans discovered the useful properties of clay and used it for making pottery . Some of the earliest pottery shards have been dated to around 14,000 BCE, and clay tablets were

600-452: Is Armenian bole , which is used to soothe an upset stomach. Some animals such as parrots and pigs ingest clay for similar reasons. Kaolin clay and attapulgite have been used as anti-diarrheal medicines. Clay as the defining ingredient of loam is one of the oldest building materials on Earth , among other ancient, naturally occurring geologic materials such as stone and organic materials like wood. Between one-half and two-thirds of

660-608: Is German for "forest" or "woods") around the three churches in Bad Marienberg , Rennerod and Emmerichenhain, west of the royal court at Herborn . Only since the mid 19th century has the name come into common usage for the whole range. The High Westerwald has since the Middle Ages formed the heart of the Herrschaft zum (also vom or auf dem ) Westerwald ("Lordship over the Westerwald"). This comprised

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720-815: Is a low mountain range on the right bank of the river Rhine in the German federal states of Rhineland-Palatinate , Hesse and North Rhine-Westphalia . It is a part of the Rhenish Massif ( Rheinisches Schiefergebirge or Rhenish Slate Mountains). Its highest elevation, at 657 m above sea level, is the Fuchskaute in the High Westerwald. Tourist attractions include the Dornburg  [ de ] (394 metres), site of some Celtic ruins from La Tène times (5th to 1st century BC), found in

780-620: Is a unique type of marine clay indigenous to the glaciated terrains of Norway , North America , Northern Ireland , and Sweden . It is a highly sensitive clay, prone to liquefaction , and has been involved in several deadly landslides . Modelling clay is used in art and handicraft for sculpting . Clays are used for making pottery , both utilitarian and decorative, and construction products, such as bricks, walls, and floor tiles. Different types of clay, when used with different minerals and firing conditions, are used to produce earthenware, stoneware, and porcelain. Prehistoric humans discovered

840-694: Is also the inspiration for the South Korean military song, "Our Nation Forever". In recent years it has become somewhat controversial in Germany due to its origins during the National Socialist era, with the German military ceasing performances of it in 2017. The standard German term for a Westerwald dweller is Westerwälder ( IPA: [ˈvɛstɐvɛldɐ] ; plural: same), but they are also popularly known as Basaltköpp (“Basalt Heads”), as they are said to be thickheaded, and they live in

900-548: Is centred on Höhr-Grenzhausen . Exports, particularly to Italy, are also important (more than one million metric tons each year). In the mid 16th century, potters from Raeren in Belgium migrated into the Westerwald, bringing with them some of their moulds . This type of pottery was taken to the New World and was found in the early Chesapeake settlements. Today one finds not only highly crafted moulded vases and mugs but also

960-459: Is clay with visible annual layers that are formed by seasonal deposition of those layers and are marked by differences in erosion and organic content. This type of deposit is common in former glacial lakes . When fine sediments are delivered into the calm waters of these glacial lake basins away from the shoreline, they settle to the lake bed. The resulting seasonal layering is preserved in an even distribution of clay sediment banding. Quick clay

1020-760: Is found south of the Rothaargebirge , southwest of the Lahn-Dill-Bergland (another low mountain range), north of the Taunus and east of the Middle Rhine and stretches more or less southwards from Siegen and Burbach , southwestwards from Haiger , northwestwards from Weilburg , northwards from Limburg an der Lahn , northeastwards from Koblenz , eastwards from Linz am Rhein , southeastwards from Wissen and southwards from Betzdorf . In its centre lie Bad Marienberg and Hachenburg . Clockwise,

1080-674: Is important to soil fertility. Clay is a common component of sedimentary rock . Shale is formed largely from clay and is the most common of sedimentary rocks. However, most clay deposits are impure. Many naturally occurring deposits include both silts and clay. Clays are distinguished from other fine-grained soils by differences in size and mineralogy. Silts , which are fine-grained soils that do not include clay minerals, tend to have larger particle sizes than clays. There is, however, some overlap in particle size and other physical properties. The distinction between silt and clay varies by discipline. Geologists and soil scientists usually consider

1140-466: Is the Fuchskaute in the High Westerwald, meaning "fox hollow". Many peaks and crests exceed the 600-metre level. Sorted by elevation above sea level, these are some of the Westerwald's highest elevations: The following are the Westerwald's rivers and streams: Weiher is a German word meaning "pond". Through prehistoric finds it can be determined that the Celts settled in the Westerwald and were using

1200-524: Is the most common sedimentary rock. Although many naturally occurring deposits include both silts and clay, clays are distinguished from other fine-grained soils by differences in size and mineralogy. Silts , which are fine-grained soils that do not include clay minerals, tend to have larger particle sizes than clays. Mixtures of sand , silt and less than 40% clay are called loam . Soils high in swelling clays ( expansive clay ), which are clay minerals that readily expand in volume when they absorb water, are

1260-512: Is used in many industrial processes, such as paper making, cement production, and chemical filtering . Bentonite clay is widely used as a mold binder in the manufacture of sand castings . Clay is a common filler used in polymer nanocomposites . It can reduce the cost of the composite, as well as impart modified behavior: increased stiffness , decreased permeability , decreased electrical conductivity , etc. Traditional uses of clay as medicine go back to prehistoric times. An example

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1320-541: The Siegerländer Erzrevier (roughly "Siegerland Ore Grounds"). Despite its relatively slight elevation, the Westerwald has for a low mountain range a typical agreeable climate. Economically and culturally, it belongs among Germany's best known mountain ranges. The name "Westerwald" was first mentioned in 1048 in a document from the Electorate of Trier and described at that time the woodlands ( Wald

1380-542: The Autobahnen A ;3 ( Cologne – Frankfurt ), A 45 ( Dortmund – Aschaffenburg ) and A 48 . The most notable railway is the Cologne-Frankfurt high-speed rail line with minor stops at Montabaur and Limburg an der Lahn. The High Westerwald is served by Siegerland Airport for private use and special touristic charters, south of Burbach . Geologically , the Westerwald is part of

1440-550: The Middle Rhine . Due to its fertile soils, the Neuwied Basin has been settled from the earliest times. The countryside is today characterised as much by intensive fruit growing as industrial sites. The urban area of the Neuwied Basin has a population of about 300,000. This southwestern part of the Middle Rhine Basin is particularly striking due to its gently rolling hills. It is bounded by the river valleys of

1500-662: The Moselle (southeast) and Elz (southwest), which cut deeply into the hill country; its northwest border is partly formed by the Nette . This regions is mainly utilised for agriculture. The soils are considered particularly fertile. Towns in the Maifeld are Polch (seat of the Verbandsgemeinde of Maifeld in the county of Mayen-Koblenz , but strictly speaking in the Pellenz ) and Münstermaifeld . This hill country forms

1560-592: The Oberwesterwald (Upper Westerwald) and Hoher Westerwald (High Westerwald) feature a much colder climate and are more prone to extreme weather, such as extreme wind gusts during extratropical cyclones . Summer days are pleasantly warm and rarely become hot due to a cool breeze, while winters are cold and rich in snow. The area is home to a number of ski areas . District seats in the Westerwald are: Altenkirchen (Altenkirchen district), Montabaur (Westerwaldkreis) and Neuwied (Neuwied district). Furthermore,

1620-408: The community of the same name , and Limburg an der Lahn , a town with a medieval centre. The geologically old, heavily eroded range of the Westerwald is in its northern parts overlaid by a volcanic upland made of Neogene basalt layers. It covers an area of some 50 km × 70 km (31 mi × 43 mi), and therefore roughly 3,000 km (1,200 sq mi), making

1680-505: The "Neues Westerwaldlied" ("New Westerwald Song") by songwriter Ulrik Remy, "Ich bin aus 'm Westerwald" ("I am from the Westerwald") and "Das schönste Mädchen vom Westerwald" ("The Loveliest Girl from the Westerwald") by Karl-Eberhard Hain and Jürgen Hardeck, made well known by De Höhner , Die Schröders and other groups. The "Westerwaldlied" is also sung by the Chilean Armed Forces and is known as "Himno de la Sección". It

1740-474: The 3rd century. Placename endings such as –ar, –mar and –aha ("Haigraha" = Haiger ) stemming from the Migration Period ( "Völkerwanderung" ) can still be found now. These lie around the forest's outer edges in basins and dales whose soils and climate were favourable to early settlers, and include, for instance, Hadamar , Lahr and Wetzlar . From the 4th to the 6th century, the settlements from

1800-527: The Dill, also belong to the Westerwald, whereas the mountains reaching up to 680 m (2,230 ft) near the Haiger Saddle ( Haiger Sattel ) and east of Siegen are counted as part of the Rothaargebirge . The Westerwald is divided by elevation into these three regions: The climate of the region vastly qualifies as oceanic (Köppen climate classification: Cfb ), while higher altitudes experience

1860-632: The Electorate of Trier were all prominent landlords. Political relations were simplified until the 16th century. Among the four greater powers' spheres of influence (Mainz, Cologne, Trier, Hesse), the House of Nassau managed to expand and strengthen its hold on its territory on the Dill between Siegen and Nassau . After the Napoleonic upheavals, Nassau had to share broad swathes of the Westerwald with

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1920-907: The Lahn-Dill-Kreis, the Mayen-Koblenz district, the Rhein-Lahn-Kreis and the Limburg-Weilburg district each have shares of the Westerwald. If Sieg is taken as the Westerwald's northernmost limit, then the Rhein-Sieg district likewise belongs here, at least in parts (for example the Siebengebirge and the communities of Eitorf and Windeck ). The Westerwald and its outer edges are crossed by stretches of Bundesstraßen 8 , 42, 49 , 54 , 62 , 255, 256, 277, 413 and 414, over which there are connections to

1980-570: The Middle Rhine Basin within major unit group 29, the Middle Rhine Region , but classifies it as a major unit in its own right (no. 291) and subdivides it into the following sub-units: This lowland area, also called the Koblenz-Neuwied Basin , which lies between the towns of Koblenz and Neuwied runs for a distance of c. 22 river kilometres along the Rhine and separates the narrow valley of Upper Rhine from that of

2040-621: The Rhenish Massif, and likewise represents a heavily eroded remnant of a great Variscan mountain system which in the Mesozoic characterized a great deal of Europe. The Devonian bedrock is covered by volcanic masses from the Tertiary , particularly basalt and tuffs . Economically important, besides slate, limestone and clay quarrying , were, and still are, iron and its processing industry between Rheintal (Unkel, Linz) and

2100-592: The Trier and Cologne mission, this area underwent Christianization. Trier advanced up the Lahn, Cologne to the Rhine and Sieg. Trier-Lorrainian and Lower Rhine influences were nevertheless brought into the Westerwald. Among the witnesses to the art of building at that time is the monastery church at Limburg- Dietkirchen , in its oldest parts. After many changes in ownership between the Ottonian and Salian noble families, it

2160-648: The Upper Westerwald, bypassing the High Westerwald, seeing it as nothing more than a trackless wooded wilderness, after which they eventually came up against the Rhine in the 2nd century. Even in the time when the Celts found themselves having to avoid the Germanic invaders by moving to the west, the Romans were also pushing in from the Rhine's left bank to the southwest. However, the Romans only managed to seize

2220-697: The Westerwald is bordered by the following river valleys: the Rhine between Koblenz and Linz , the Sieg as far as Betzdorf, the Heller , the Dill and from its mouth near Wetzlar , the Lahn up to Lahnstein . Geomorphologically , the Westerwald belongs to the Rhenish Massif, which forms the greater part of that range's eastern half on the Rhine's right bank. Likewise, the Gladenbach Uplands , lying east of

2280-418: The Westerwald one of Germany's biggest mountain ranges by area. In areas of subsidence , it has in its flatter western part (Lower Westerwald) the characteristics of rolling hills. Typical for the economy of the Upper Westerwald, some 40% of which is actually wooded, are traditional slate mining, clay quarrying , diabase and basalt mining, pottery and the iron ore industry, and among other things mining in

2340-481: The Westerwald's north and southwest edges even gave two Lower Devonian layers, with their colourful slates, their names. The upper mountain layers are formed of volcanic strata made of basalt containing tuffs. In a few areas, slate and clay have long been quarried, the latter notably in the so-called Kannenbäckerland , but also in a few other places where the clay is worked into the salt- glazed grey Westerwald Pottery with cobalt blue decoration. The pottery industry

2400-415: The cohesion that makes it plastic. In kaolinite clay, the bonding between plates is provided by a film of water molecules that hydrogen bond the plates together. The bonds are weak enough to allow the plates to slip past each other when the clay is being moulded, but strong enough to hold the plates in place and allow the moulded clay to retain its shape after it is moulded. When the clay is dried, most of

2460-399: The first known writing medium. Clay is used in many modern industrial processes, such as paper making, cement production, and chemical filtering . Between one-half and two-thirds of the world's population live or work in buildings made with clay, often baked into brick, as an essential part of its load-bearing structure. Clay is a very common substance. Shale , formed largely from clay,

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2520-516: The first known writing medium. Clay was chosen due to the local material being easy to work with and widely available. Scribes wrote on the tablets by inscribing them with a script known as cuneiform , using a blunt reed called a stylus , which effectively produced the wedge shaped markings of their writing. After being written on, clay tablets could be reworked into fresh tablets and reused if needed, or fired to make them permanent records. Purpose-made clay balls were used as sling ammunition . Clay

2580-642: The iron ore deposits in the so-called Hallstatt times ( Iron Age , roughly 750 to 500 BC). In all likelihood they came into the area from the Hunsrück . From La Tène times come the Celtic ringwall-girded defensive and sheltering castles which may be found on, among other peaks, the Malberg. Already by La Tène times, Germanic peoples were thrusting in from the east and from the Sieg valley. They came about 380 BC into

2640-603: The lower Wied, pumice gravel in the Neuwied Basin, various mineral springs and, once, brown coal mining. The whole Westerwald region lay under a tropically warm arm of the sea in the Palaeozoic (600 to 270 million years ago). This sea deposited layers of sediments many kilometres thick into the Variscan geosyncline , which were heavily folded in the orogeny that followed. The towns of Siegen and Koblenz on

2700-404: The material. The clay mineral kaolinite is transformed into a non-clay material, metakaolin , which remains rigid and hard if moistened again. Further firing through the stoneware and porcelain stages further recrystallizes the metakaolin into yet stronger minerals such as mullite . The tiny size and plate form of clay particles gives clay minerals a high surface area. In some clay minerals,

2760-724: The moulded clay is just dry enough to hold its shape. The plastic limit of kaolinite clay ranges from about 36% to 40% and its liquid limit ranges from about 58% to 72%. High-quality clay is also tough, as measured by the amount of mechanical work required to roll a sample of clay flat. Its toughness reflects a high degree of internal cohesion. Clay has a high content of clay minerals that give it its plasticity. Clay minerals are hydrous aluminium phyllosilicate minerals , composed of aluminium and silicon ions bonded into tiny, thin plates by interconnecting oxygen and hydroxide ions. These plates are tough but flexible, and in moist clay, they adhere to each other. The resulting aggregates give clay

2820-501: The newly minted power Prussia . A sovereign Duchy of Nassau existed until it was annexed by Prussia in 1866. Nowadays, the Westerwald is shared among three German federal states: Hesse, North Rhine-Westphalia and Rhineland-Palatinate. The Westerwald is also internationally known in songs, above all in folksongs , and particularly the "Westerwaldlied" ("Westerwald Song"), as well as "Westerwald-Marsch" ("Westerwald March"), "Westerwald, du bist so schön" ("Westerwald, you are so lovely"),

2880-525: The northwestern part of the basin between Mayen and Andernach . It is characterized by agriculture and open-cast mining ( pumice and lava sand) and the associated building materials industry. The river Nette flows through the hilly landscape which slopes gently from west to east towards the Rhine and separates it from the Maifeld . Westerwald The Westerwald ( German pronunciation: [ˈvɛstɐvalt] ; literally 'Western forest')

2940-467: The plates carry a negative electrical charge that is balanced by a surrounding layer of positive ions ( cations ), such as sodium, potassium, or calcium. If the clay is mixed with a solution containing other cations, these can swap places with the cations in the layer around the clay particles, which gives clays a high capacity for ion exchange . The chemistry of clay minerals, including their capacity to retain nutrient cations such as potassium and ammonium,

3000-696: The separation to occur at a particle size of 2 μm (clays being finer than silts), sedimentologists often use 4–5 μm, and colloid chemists use 1 μm. Clay-size particles and clay minerals are not the same, despite a degree of overlap in their respective definitions. Geotechnical engineers distinguish between silts and clays based on the plasticity properties of the soil, as measured by the soils' Atterberg limits . ISO 14688 grades clay particles as being smaller than 2 μm and silt particles as being larger. Mixtures of sand , silt and less than 40% clay are called loam . Some clay minerals (such as smectite ) are described as swelling clay minerals, because they have

3060-841: The site of formation. Secondary clays are clays that have been transported from their original location by water erosion and deposited in a new sedimentary deposit. Secondary clay deposits are typically associated with very low energy depositional environments such as large lakes and marine basins. The main groups of clays include kaolinite , montmorillonite - smectite , and illite . Chlorite , vermiculite , talc , and pyrophyllite are sometimes also classified as clay minerals. There are approximately 30 different types of "pure" clays in these categories, but most "natural" clay deposits are mixtures of these different types, along with other weathered minerals. Clay minerals in clays are most easily identified using X-ray diffraction rather than chemical or physical tests. Varve (or varved clay )

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3120-586: The three court districts of Marienberg , Emmerichenhain and Neukirch . The Lordship later fell under the governance of the Lordship or County of Beilstein. The Westerwald lies mostly southwest of the three-state common point shared by Rhineland-Palatinate, Hesse and North Rhine-Westphalia in the districts of Altenkirchen , Lahn-Dill , Limburg-Weilburg , Neuwied , Rhein-Lahn , Rhein-Sieg , Westerwaldkreis and partly in Siegen-Wittgenstein . It

3180-564: The time of the taking of the land arose in formerly pathless areas, taking endings such as –ingen and –heim , like Bellingen and Bladernheim ; these lie on the broad, raised plains in the Upper Westerwald. The Franks built their old settlements on the edge of the Westerwald in the central areas of their districts, to build up slowly and permanently strongholds in the interior. There arose places with names ending in –rode, –scheid, –hahn, –berg, –tal and –seifen . Once clearing settlements had been established and logging for iron ore smelting

3240-548: The useful properties of clay. Some of the earliest pottery shards recovered are from central Honshu , Japan . They are associated with the Jōmon culture, and recovered deposits have been dated to around 14,000 BCE. Cooking pots, art objects, dishware, smoking pipes , and even musical instruments such as the ocarina can all be shaped from clay before being fired. Ancient peoples in Mesopotamia adopted clay tablets as

3300-426: The water molecules are removed, and the plates hydrogen bond directly to each other, so that the dried clay is rigid but still fragile. If the clay is moistened again, it will once more become plastic. When the clay is fired to the earthenware stage, a dehydration reaction removes additional water from the clay, causing clay plates to irreversibly adhere to each other via stronger covalent bonding , which strengthens

3360-493: The world's population, in both traditional societies as well as developed countries, still live or work in buildings made with clay, often baked into brick, as an essential part of their load-bearing structure. Also a primary ingredient in many natural building techniques, clay is used to create adobe , cob , cordwood , and structures and building elements such as wattle and daub , clay plaster, clay render case, clay floors and clay paints and ceramic building material . Clay

3420-463: Was here 380,000,000 years ago. Parts of this limestone formation are worked in open-pit mining ; near Enspel , a " fossil conservation area" has been instituted, in which institutes from several colleges conduct research and excursions. A few karst caves are of interest to spelaeology and bring about the temporary disappearance and reappearance of the Erdbach. The Westerwald's highest mountain

3480-575: Was in the end the Counts of Sayn, Diez and Wied who managed to take hold of extensive landholdings. Particular importance was achieved by the Counts of Laurenburg, who later called themselves the Counts of Nassau . In the east, the Landgraves of Hesse put it about that they could beat the Archbishopric of Mainz on the battlefield. Moreover, the Counts of Wied, the Counts of Sayn-Wittgenstein and

3540-403: Was under way, the widespread destruction of the forest began. Between the 6th and 9th centuries came settlement expansion from the old settlements towards the edges, a process still witnessed in placename endings such as –hausen, –hofen, –kirch, –burg or –tal . The last settlement period in the Westerwald began in the 10th century and ended about 1300. Through Carolingian policy and therefore

3600-461: Was used as a mortar in brick chimneys and stone walls where protected from water. Clay, relatively impermeable to water, is also used where natural seals are needed, such as in pond linings, the cores of dams , or as a barrier in landfills against toxic seepage (lining the landfill, preferably in combination with geotextiles ). Studies in the early 21st century have investigated clay's absorption capacities in various applications, such as

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