Libyan Desert
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The Libyan Desert (24 degrees North, 25 degrees East) (Arabic: الصحراء الليبية) is an African desert that is located in the northern and eastern part of the Sahara Desert and occupies southwestern Egypt, eastern Libya and northwestern Sudan. Covering an area of approximately 1,100,000 square kilometers it extends approximately 1,100 km from east to west, and 1,000 km from north to south, in about the shape of a rectangle.
This desert is primarily sand and boulder plain and is inhabited by the Senussi. The dominant wildlife are sand vipers and scorpions.
Ridges and deep depressions (basins) exist in several parts of the desert, and no rivers or streams drain into or out of the area. The desert's Jilf al Kabir Plateau has an altitude of about 2,000 meters, an exception to the uninterrupted territory of basement rocks covered by layers of horizontally bedded sediments, forming a massive plain or low plateau.
There are eight important depressions in the Libyan Desert, and all are considered oases except the smallest, Qattara, because its waters are salty. Limited agricultural production, the presence of some natural resources, and permanent settlements are found in the other seven depressions, all of which have fresh water provided by the Nile or by local groundwater.
The Siwa Oasis, close to the Libyan border and west of Qattara, is isolated from the rest of Egypt but has sustained life since ancient times.
The other major oases include Dakhla and Kharga in Egypt, and Jaghbub in Libya, which, along with Siwah, form a topographic chain of basins extending from the Al Fayyum Oasis (sometimes called the Fayyum Depression) which lies sixty kilometers southwest of Cairo, south to the Bahriyah, Farafra and Dakhla oases before reaching the country's largest oasis, Kharga Oasis. A brackish lake, Lake Karun, at the northern reaches of Al Fayyum Oasis, drained into the Nile in ancient times. For centuries sweetwater artesian wells in the Fayyum Oasis have permitted extensive cultivation in an irrigated area that extends over 2,100 square kilometers.
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[edit] Key geographic feaures of the Libyan Desert
[edit] The Qattara Depression
The Qattara Depression, which contains the second lowest point in Africa, is approximately 15,000 square km (about the size of Connecticut and Rhode Island), and is largely below sea level (its lowest point is 133 meters below sea level). The sparsely inhabited Qattara Depression is covered by badlands, salt marshes and salt lakes.
[edit] The Gilf Kebir
The Gilf Kebir plateau rises about 300 metres (1,000 ft) above the general plain, and lies entirely in Egypt. It roughly equals Switzerland in size, and is similar in structure to the other sandstone plateaus of the central Sahara. Its south-eastern part is well defined on all sides, with sheer cliffs and deep, narrows wadis. The northeast part, separated from the other half by a broad valley called the "Gap" is more broken, and supports three large wadis with vegetation.
[edit] The Sand Seas
The three sand seas, which contain dunes up to 110 meters in height and which cover approximately one quarter of the region include:
