A hill chain, sometimes also hill ridge, is an elongated line of

hill A hill is a landform that extends above the surrounding terrain. It often has a distinct summit, and is usually applied to peaks which are above elevation compared to the relative landmass, though not as prominent as Mountain, mountains. Hills ...

s that usually includes a succession of more or less prominent hilltops, domed summits or '' kuppen'', hill ridges and

saddles A saddle is a supportive structure for a rider of an animal, fastened to Mammal#Anatomy, an animal's back by a girth (tack), girth. The most common type is List of equestrian sports, equestrian. However, specialized saddles have been created ...

and which, together with its associated lateral ridges and branches, may form a complex

topographic Topography is the study of the forms and features of land surfaces. The topography of an area may refer to the landforms and features themselves, or a description or depiction in maps. Topography is a field of geoscience and planetary scienc ...

structure. It may occur within a

hill 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 ...

, within an area of low rolling hill country or on a

plain In geography, a plain, commonly known as flatland, is a flat expanse of land that generally does not change much in elevation, and is primarily treeless. Plains occur as lowlands along valleys or at the base of mountains, as coastal plains, and ...

. It may link two or more otherwise distinct hill ranges. The transition from a hill chain to a

mountain chain A mountain chain is a row of high mountain summits, a linear sequence of interconnected or related mountains,Whittow, John (1984). ''Dictionary of Physical Geography''. London: Penguin, p 87. . or a contiguous ridge of mountains within a larger mo ...

is blurred and depends on regional definitions of a hill or

mountain A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain may differ from a plateau in having a limited summit area, and is usually higher t ...

. For example, in the UK and Ireland a mountain must officially be or higher, whereas in North America mountains are often (unofficially) taken as being high or more. The chain-like arrangement of hills in a chain is a consequence of their collective formation by

mountain building Mountain formation occurs due to a variety of geological processes associated with large-scale movements of the Earth's crust (List of tectonic plates, tectonic plates). Fold (geology), Folding, Fault (geology), faulting, Volcano, volcanic acti ...

forces or

ice age An ice age is a long period of reduction in the temperature of Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers. Earth's climate alternates between ice ages, and g ...

earth movements. Hill chains generally have a uniform

geological Geology (). is a branch of natural science concerned with the Earth and other astronomical objects, the rocks of which they are composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth s ...

age, but may comprise several types of

rock Rock most often refers to: * Rock (geology), a naturally occurring solid aggregate of minerals or mineraloids * Rock music, a genre of popular music Rock or Rocks may also refer to: Places United Kingdom * Rock, Caerphilly, a location in Wale ...

sediment Sediment is a solid material that is transported to a new location where it is deposited. It occurs naturally and, through the processes of weathering and erosion, is broken down and subsequently sediment transport, transported by the action of ...

. Hill chains normally form a

watershed Watershed may refer to: Hydrology * Drainage divide, the line that separates neighbouring drainage basins * Drainage basin, an area of land where surface water converges (North American usage) Music * Watershed Music Festival, an annual country ...

. They are crossed by roads that often use a natural saddle in the terrain.

Examples

* the Argonne hill chain, in

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 Fläming south of Berlin in

Germany Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total popu ...

. * the

Malvern Hills The Malvern Hills are in the English counties of Worcestershire, Herefordshire and a small area of northern Gloucestershire, dominating the surrounding countryside and the towns and villages of the district of Malvern. The highest summit af ...

in central

England England is a Countries of the United Kingdom, country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and List of islands of England, more than 100 smaller adjacent islands. It ...

. * the ridge between the

Taunus The Taunus () is a mountain range in Hesse and Rhineland-Palatinate, Germany, located north west of Frankfurt and north of Wiesbaden. The tallest peak in the range is '' Großer Feldberg'' at 878 m; other notable peaks are '' Kleiner Feldberg' ...

and Vogelsberg, which lies south of

Giessen Giessen, spelled in German (), is a town in the Germany, German States of Germany, state () of Hesse, capital of both the Giessen (district), district of Giessen and the Giessen (region), administrative region of Giessen. The population is appro ...

and forms the watershed between the

Lahn The Lahn () is a , right (or eastern) tributary of the Rhine in Germany. Its course passes through the States of Germany, federal states of North Rhine-Westphalia (23.0 km), Hesse (165.6 km), and Rhineland-Palatinate (57.0 km). ...

valley and the

Wetterau The Wetterau (, ) is a fertile undulating tract, watered by the Wetter (river), Wetter, a tributary of the Nidda (river), Nidda River, in the western German state of Hesse, between the hilly province Oberhessen and the north-western Taunus mounta ...

Examples

See also

References

Literature

External links