Wadi Igharghar

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Wadi Igharghar
Oued Irharrhar
Data
location Tamanrasset , Djanet , Illizi and Ouargla provinces in Algeria
River system Wadi Igharghar
Head of the valley North side of the main ridge line of the Ahaggar Mountains 40 km west-southwest of Tazrouk
23 ° 17 '35 "  N , 5 ° 53' 14"  O
Source height approx.  2390  m
muzzle Silting up in the eastern Great Erg , last traces in a depression named after him south of Touggourt Coordinates: 32 ° 47 ′ 25 ″  N , 6 ° 3 ′ 52 ″  E, 32 ° 47 ′ 25 ″  N , 6 ° 3 ′ 52 ″  E
Mouth height approx.  95  m
Height difference approx. 2295 m
Bottom slope approx. 2.2 ‰
length Air line distance 1056 km

The Wadi Igharghar or the Oued Irharrhar is a dry valley of the Sahara in southeastern Algeria .

Course and geomorphology

The valley begins on the north side of the main ridge line of the Ahaggar Mountains , on the eastern slope of the easternmost summit, which exceeds the 2500 meter mark. From here, the valley takes the path between the Irawen Mountains and the strata of the Tassili n'Ajjer in a general north direction and, after crossing the Tinrhert plateau, runs northwest of the oasis of Bordj Omar Driss in the sand of the Eastern Great Erg . Its course can still be followed hundreds of kilometers under the sand cover. In particular, a depression with a height of 95 meters above sea level 30 km south of the oasis town of Touggourt is associated with the Oued Irharrhar.

The wadi is shaped as a trough-like valley with a bed 10 to 15 km wide, on which surface types such as Reg or Serir and secondary relief types such as dune fields can be found due to secondary formation conditions. In contrast to the lower reaches, the valley character is retained here. Its active sections are in the Hoggar, the Tassilis at narrow points and on the plateau; the 200 km between these elevations are permanently dry.

Individual evidence

  1. ↑ Height of the valley head according to the contour lines on the map at Geonames
  2. ↑ Muzzle height according to Geonames
  3. ↑ Measure distance with google maps
  4. ↑ Xavier de Planhol and Pierre Rognon: Les zones tropicales arides et subtropicales. Colin, Paris 1970, quoted in Helga Besler: Geomorphology of the arid areas . Scientific Book Society Darmstadt, Darmstadt 1992, ISBN 3-534-10922-8 . , P. 113f.

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