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The ARDEY HILLS (German : Ardeygebirge or Ardey) are a range of wooded hills, up to 273.8 m above sea level (NN) , in the territory of the city of Dortmund
Dortmund
and the districts of Ennepe-Ruhr-Kreis and Unna in the German state of North Rhine-Westphalia
North Rhine-Westphalia
. The hills form part of the eastern Rhenish Massif
Rhenish Massif
and, to a lesser extent, to the Berg-Mark Hills (Bergisch-Märkisches Hügelland).

CONTENTS

* 1 Geography

* 1.1 Location * 1.2 Settlements * 1.3 Elevations

* 2 Geology and history * 3 Landscape * 4 Walking * 5 References

GEOGRAPHY

LOCATION

The Ardey Hills, together with the Haarstrang , run from east to west, separating two major natural units: the Westphalian Lowland including the Emscher Depression and Hellwegbörde in the north from the Süder Uplands
Süder Uplands
and lower Sauerland
Sauerland
in the south, the Ardey being counted as part of the Süder Uplands
Süder Uplands
and the Haarstrang the Westphalian Lowland.

From a topographical perspective, the Ardey Hills
Ardey Hills
are the western foothills of the sparsely wooded and mainly agricultural Haarstrang. However it is different, not only from a cultural landscape point of view, but also geologically (a decisive factor being the carboniferous boundary near the surface).

In the north, on the territory of the city of Dortmund
Dortmund
, the Ardey Hills descend gradually into the plain of the Westphalian Lowland in the area of Münsterland . To the south and west they are bounded by the River Ruhr
Ruhr
, their rugged slopes often dropping steeply into its valley. On those slopes the point where there is the maximum 165.2 m height difference, from the upper storage basin (ca. 261.5 m above NN) to the Hengsteysee
Hengsteysee
(96.3 m above NN ), is used by the pumped-storage power station of Koepchenwerk in Herdecke to generate electricity from hydropower .

SETTLEMENTS

The following cities and towns are located in or at the Ardey Hills along the Ruhr
Ruhr
− from east-northeast to west-southwest −: Fröndenberg , Unna , Holzwickede
Holzwickede
, Schwerte
Schwerte
, Dortmund
Dortmund
, Herdecke , Wetter and Witten
Witten
.

ELEVATIONS

The highest point in the Ardey Hills
Ardey Hills
is the long ridge of Auf dem Heil, which rises in the territory of Herdecke west of the town itself. This and the other high points in the Ardey are shown below in order of height (m) above sea level (NN):

* Auf dem Heil (273.8 m), Herdecke * Klusenberg
Klusenberg
(254.3 m), Dortmund-Syburg * Ahlenberg (247.5 m), Herdecke * Wartenberg (246.1 m), Witten
Witten
* Syberg (245.4 m), Dortmund-Syburg * Harkortberg (231.5 m), Wetter * Ebberg (222.3 m), Schwerte
Schwerte
* Rehberg (197.9 m), Herdecke * Hohenstein (ca. 146 m), Witten
Witten

GEOLOGY AND HISTORY

Predominantly acidophilous sandstone and clay (argillaceous shales) as well as grauwackes from the Carboniferous
Carboniferous
form the geological base of the Ardey Hills. They are the source of the Ruhr
Ruhr
Sandstone
Sandstone</