A dune is a landform composed of wind- or water-driven sand. It typically takes the form of a mound, ridge, or hill. An area with dunes is called a dune system or a dune complex. A large dune complex is called a dune field, while broad, flat regions covered with wind-swept sand or dunes with little or no vegetation are called ergs or sand seas. Dunes occur in different shapes and sizes, but most kinds of dunes are longer on the stoss (upflow) side, where the sand is pushed up the dune, and have a shorter slip face in the lee side. The valley or trough between dunes is called a dune slack.
Libya is fourth in size among the countries of Africa and sixteenth among the countries of the world. It is on the Mediterranean between Egypt and Tunisia, with Niger and Chad to the south and Sudan to the southeast. Although the oil discoveries of the 1960s have brought immense wealth, at the time of its independence it was an extremely poor desert state whose only important physical asset appeared to be its strategic location at the midpoint of Africa's northern rim.
Algeria comprises 2,381,740 square kilometres (919,590 sq mi) square kilometers of land, more than 80% of which is desert, in North Africa, between Morocco and Tunisia. It is the largest country in Africa. Its Arabic name, Al Jazair, is believed to derive from the rocky islands along the coastline of the Mediterranean Sea. The northern portion, an area of mountains, valleys, and plateaus between the Mediterranean and the Sahara Desert, forms an integral part of the section of North Africa known as the Maghreb. This area includes Morocco, Tunisia, and the northwestern portion of Libya known historically as Tripolitania.
The Libyan Desert is a geographical region filling the north-eastern Sahara Desert, from eastern Libya to the Western Desert of Egypt and far northwestern Sudan. On medieval maps, its use predates today's Sahara, and parts of the Libyan Desert include the Sahara's most arid and least populated regions; this is chiefly what sets the Libyan Desert apart from the greater Sahara. The consequent absence of grazing, and near absence of waterholes or wells needed to sustain camel caravans, prevented Trans-Saharan trade between Kharga close to the Nile, and Murzuk in the Libyan Fezzan. This obscurity saw the region overlooked by early European explorers, and it was not until the early 20th century and the advent of the motor car before the Libyan Desert started to be fully explored.
The Calanshio Sand Sea is a sand desert region located in the Libyan Desert, of the Kufra District in Cyrenaica, eastern Libya. It has a surface of approximately 62,000 km². The erg extends from Jaghbub and Jalo in the north to Kufra in the south, a distance of 500km.
Fezzan is the southwestern region of modern Libya. It is largely desert, but broken by mountains, uplands, and dry river valleys (wadis) in the north, where oases enable ancient towns and villages to survive deep in the otherwise inhospitable Sahara Desert. The term originally applied to the land beyond the coastal strip of Africa proconsularis, including the Nafusa and extending west of modern Libya over Ouargla and Illizi. As these Berber areas came to be associated with the regions of Tripoli, Cirta or Algiers, the name was increasingly applied to the arid areas south of Tripolitania.
Aeolian processes, also spelled eolian, pertain to wind activity in the study of geology and weather and specifically to the wind's ability to shape the surface of the Earth. Winds may erode, transport, and deposit materials and are effective agents in regions with sparse vegetation, a lack of soil moisture and a large supply of unconsolidated sediments. Although water is a much more powerful eroding force than wind, aeolian processes are important in arid environments such as deserts.
Ubari or Awbari is a Tuareg Berber–speaking oasis town and the capital of the Wadi al Hayaa District, in the Fezzan region of southwestern Libya. It is in the Idehan Ubari, a Libyan section of the Sahara Desert. It was the capital of the former baladiyah (district) called Awbari, in the southwest of the country.
Murzuk, Murzuq, Murzug or Merzug is an oasis town and the capital of the Murzuq District in the Fezzan region of southwest Libya. It lies on the northern edge of the Murzuq Desert, an extremely arid region of ergs or great sand dunes which is part of the greater Sahara Desert.
A desert pavement, also called reg, serir, gibber, or saï is a desert surface covered with closely packed, interlocking angular or rounded rock fragments of pebble and cobble size. They typically top alluvial fans. Desert varnish collects on the exposed surface rocks over time.
Gaberoun is an oasis with a large lake in the Idehan Ubari desert region of the Libyan Sahara. Administratively it is located Wadi al Hayaa District of the Fezzan region in southwestern Libya.
An erg is a broad, flat area of desert covered with wind-swept sand with little or no vegetative cover. The word is derived from the Arabic word ʿarq (عرق), meaning "dune field". Strictly speaking, an erg is defined as a desert area that contains more than 125 km2 (48 sq mi) of aeolian or wind-blown sand and where sand covers more than 20% of the surface. Smaller areas are known as "dune fields". The largest hot desert in the world, the Sahara, covers 9 million square kilometres and contains several ergs, such as the Chech Erg and the Issaouane Erg in Algeria. Approximately 85% of all the Earth's mobile sand is found in ergs that are greater than 32,000 km2 (12,355 sq mi). Ergs are also found on other celestial bodies, such as Venus, Mars, and Saturn's moon Titan.
The Great Sand Sea is an approximately 72,000 km2 (28,000 sq mi) sand desert (erg) in the Sahara between western Egypt and eastern Libya in North Africa. Most of the area is covered by sand dunes.
The Grand Erg Oriental is a large erg or "field of sand dunes" in the Sahara Desert. Situated for the most part in Saharan lowlands of northeast Algeria, the Grand Erg Oriental covers an area some 600 km wide by 200 km north to south. The erg's northeastern edge spills over into neighbouring Tunisia.
The Sirte Basin is a late Mesozoic and Cenozoic triple junction continental rift along northern Africa that was initiated during the late Jurassic Period. It borders a relatively stable Paleozoic craton and cratonic sag basins along its southern margins. The province extends offshore into the Mediterranean Sea, with the northern boundary drawn at the 2,000 meter (m) bathymetric contour. It borders in the north on the Gulf of Sidra and extends south into northern Chad.
A desert is a barren area of landscape where little precipitation occurs and, consequently, living conditions are hostile for plant and animal life. The lack of vegetation exposes the unprotected surface of the ground to denudation. About one-third of the land surface of the Earth is arid or semi-arid. This includes much of the polar regions, where little precipitation occurs, and which are sometimes called polar deserts or "cold deserts". Deserts can be classified by the amount of precipitation that falls, by the temperature that prevails, by the causes of desertification or by their geographical location.
The Issaouane Erg is an approximately 38,000 km2 erg in Algeria's portion of the Sahara desert, located at 27.83°N 7.25°E.
M'Hamid El Ghizlane, also known as Lamhamid Ghozlane, is a small oasis town in Zagora Province, Drâa-Tafilalet, Morocco, with about 7500 inhabitants.
The Ubari Desert, Idehan Ubari, Idehan Awbari or Ubari Erg is an erg in the hyper-arid Fezzan region of southwestern Libya with a surface of approximately 58,000 km². The area of the Ubari desert has been traditionally inhabited by Tuareg people.
