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Posts tagged Grand Erg Oriental

Dunes and Mountains of the Sahara Desert

28.2N 6.0E

October 13th, 2010 Category: Deserts, Mountains

Tunisia, Algeria and Niger - September 15th, 2010

This image stretches across the arid Sahara Desert. In the full image, it reaches from southern Tunisia, across Algeria, and over much of Niger (from north to south).

The upper part of the full image contains the driest areas, particularly the “sea” of sand dunes of the Grand Erg Oriental, (appearing smooth and yellow to orange in color, near the top). The smooth appearance is deceiving, however, as many of the dunes are extremely high.

The Grand Erg Oriental covers an area some 600 km. wide by 200 km. north to south, making it the largest erg in Algeria. The erg’s northeastern corner spills over into neighbouring Tunisia.

Moving southward, one crosses over the mountains of the Tassili n’Ajjer (dark brown), the Ahaggar Range (lighter brown, south of the former) and finally the Aïr Mountains (further south, along the right edge of the full image). Towards the very bottom of the full image, the terrain begins to appear slightly green in color and less arid.

Sand Dunes of the Grand Erg Oriental, Algeria – October 7th, 2010

30.6N 7.5E

October 7th, 2010 Category: Deserts, Image of the day

Algeria - August 27th, 2010

This image focuses on the Grand Erg Oriental, situated for the most part in Saharan lowlands of northeast Algeria. An erg is a field or “sea” of sand dunes in the Sahara desert.

The Grand Erg Oriental covers an area some 600 km. wide by 200 km. north to south, making it the largest erg in Algeria. The erg’s northeastern corner spills over into neighbouring Tunisia.

Upon opening the full image, many individual rows of high sand dunes can be observed. Also visible at the bottom of the full version are the Ahaggar Mountains. If any water were to reach the erg, it would be from mostly dry and buried rivers originating in those mountains and flowing down and northward.

Grand Erg Oriental Stretching Across Algeria

30.0N 7.0E

May 24th, 2010 Category: Snapshots

Algeria - April 28th, 2010

Algeria - April 28th, 2010

The Grand Erg Oriental, meaning the “‘Great Eastern Sand Sea”, 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 corner spills over into neighbouring Tunisia.

In a desert region, an erg is an area of large accumulation of sand, generally in the bottom of a huge basin in which a former river piled up alluvium. Ergs are areas of actively shifting dunes, “fossilized” dunes, or extensive sand sheets. The sand is generally loose and is extremely difficult to cross.

Ergs of the Sahara Desert in Northern Africa

31.6N 6.0E

April 20th, 2010 Category: Snapshots

Tunisia - March 5th, 2010

Tunisia - March 5th, 2010

The Sahara Desert sweeps across northern Africa, visible here in parts of Algeria (left), Tunisia (above center) and Libya (right). The desert is composed of several “seas” of sand dunes, known as erg.

Here, the Grand Erg Oriental appears as an expansive area of yellow sand framed by orange sand along its eastern extremity, in the center of the image. The erg is located predominately in Algeria but spreads across the southwestern edge of Tunisia. To the south is Erg Issaouane, with the dunes of Idehan Ubari and Idehan Murzuk to the southeast.

Salt Lakes of Chott el Djerid, Tunisia and Chott Melrhir, Algeria

33.6N 8.3E

March 8th, 2010 Category: Lakes, Salt Flats

Tunisia - March 5th, 2010

Tunisia - March 5th, 2010

Two salt lakes are visible in the middle section of this image of northern Africa: the Chott el Djerid in Tunisia, right, and the Chott Melrhir in Algeria, left. The Grand Erg Oriental of the Sahara Desert begins south of the lakes.

Chott el Djerid is a large endorheic salt lake in southern Tunisia, at. It is the largest salt pan of the Sahara with a surface area of over 7,000 km² (some sources state 5,000 km²). Due to the extreme climate with annual rainfall of only 100 mm and temperatures reaching 50° C, water evaporates from the lake. In summer Chott el Djerid is almost entirely dried up.

Chott Melrhir is a large endorheic salt lake in northeastern Algeria. It has an area of about 6700 km² and is the largest lake in Algeria. It also lies almost entirely below the sea level; the lowest point of Algeria is located here. It regularly dries up and thus becomes a salt pan. Chott Melrhir is designated a Ramsar wetland of international importance.

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