ad-Dahna Desert

ad-Dahna Desert
Satellite view of Al-Dahna desert.

ad-Dahna Desert is the central division of the Arabian Desert. It is a corridor of sandy terrain forming a bow-like shape that connects an-Nafud desert in the north to Rub' al-Khali desert in the south. Its length is more than 1000 km siding Twaik Mountains from the east and does not exceed 80 km in width. It is also considered the geographical margin separating Al-Ahsa Province from Najd.

Al-Dahna desert is formed of high sand dunes spreading horizontally which are called veins (ar: عروق), mostly red in color since it contains Iron Oxides.

Beneath the harsh deserts of Saudi Arabia lie dark chambers and complex mazes filled Crystalline structures, stalactites and stalagmites. The limestone floor pf the Summan plateau, a karst area to the east of the Dahna sands, is riddled with such caves, known locally as Dahls. Some have tiny entrances which open into caves, others lead into a maze of passages which can be several kilometers long. Essential to the formation of these underground cavities is the action of water percolating through the soluble rocks. The process is slow. Rainwater absorbs fractional amounts of Carbon dioxide from the air as it falls, making a weak carbonic acid solution that eats into the limestone and eventually forms hollows and channels Local bedouin have always know these caves and some were used as water supplies. First systematically studied in the 1981,and currently being explored and reported by the Saudi Geological survey.



External links

This article incorporates text from the public domain 1907 edition of The Nuttall Encyclopædia.



Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • Ad-Dahna Desert — is the central division of the Arabian Desert. It is a corridor of sandy terrain that connects the large an Nafud desert to the Rub al Khali …   Wikipedia

  • DAHNA DESERT —    the central division of the Arabian Desert …   The Nuttall Encyclopaedia

  • Desert — Not to be confused with dessert. This article is about dry terrain. For the act of abandoning or withdrawing support, see desertion. For other uses, see Desert (disambiguation) …   Wikipedia

  • Dahnāʾ, ad- — ▪ desert, Saudi Arabia       (Arabic: “desert”), great arc of reddish sandy desert, central Saudi Arabia, extending about 800 miles (1,300 km) southward from the northeastern edge of an Nafūd (Nafūd, An ) (desert) to the northwestern borders of… …   Universalium

  • Desert exploration — is the deliberate and scientific exploration of deserts, the arid regions of the earth. It is only incidentally concerned with the culture and livelihood of native desert dwellers. The nature of deserts ensures that the story of their exploration …   Wikipedia

  • Desert Magazine — The Southwest Desert: with a native palm oasis in the Colorado Desert region. Desert Magazine (1937 1985) was a monthly regional publication based in the Colorado Desert, in the Coachella Valley town of Palm Desert near Palm Springs, United… …   Wikipedia

  • Dahna — noun a desert in southern Saudi Arabia • Syn: ↑Rub al Khali, ↑Ar Rimsal, ↑Great Sandy Desert • Instance Hypernyms: ↑desert • Part Holonyms: ↑Saudi Arabia, ↑Kingdom of Saud …   Useful english dictionary

  • desert — I (New American Roget s College Thesaurus) I n. waste, wilderness, solitude. See uselessness, seclusion. II v. leave, forsake, abandon; secede, run away; leave in the lurch, be faithless, ditch (sl.). See avoidance, relinquishment. n. reward, due …   English dictionary for students

  • Dahna — /dah neuh, heuh neuh/, n. 1. an area in the NE Rub al Khali desert, comprising a region of E central Saudi Arabia. 2. See Rub al Khali. * * * …   Universalium

  • Arabian Desert — The Arabian Desert is a vast desert wilderness stretching from Yemen to the Persian Gulf and Oman to Jordan and Iraq. It occupies most of the Arabian Peninsula with an area of 2,330,000 square kilometers (900,000 mi²)cite book | first=John W. (ed …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”