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Posts tagged Dorsal

Djebel Bargou in the Dorsal Range, Tunisia

36.0N 9.6E

February 24th, 2011 Category: Mountains

Tunisia - February 18th, 2011

This APM image shows the Djebel Bargou (center), a mountain in Tunisia that reaches an altitude of 1266 meters.It is situated in the central north part of the country, about 20 kilometers southeast of Siliana.

Djebel Bargou is one of the peaks that makes up the western segment of the northern half of the Dorsal. The eastern extension of the Atlas Mountains, the Dorsal runs across Tunisia in a northeasterly direction from the Algerian border in the west to the Cape Bon peninsula in the east.

Tunisia, from the Fertile Coasts to the Arid Desert – March 7th, 2009

March 7th, 2009 Category: Image of the day

Tunisia - February 26th, 2009

Tunisia - February 26th, 2009



Tunisia is a country situated on the Mediterranean coast of North Africa, midway between the Atlantic Ocean and the Nile Valley. It is the northernmost country on the African continent.

Around forty percent of the country is composed of the Sahara desert, with much of the remainder consisting of particularly fertile soil and a 1300 km coastline.

An abrupt southern turn of its shoreline gives Tunisia two faces on the Mediterranean.

Despite its relatively small size, Tunisia has great geographical and climactic diversity.



The Dorsal, an extension of the Atlas Mountains, traverses Tunisia in a northeasterly direction from the Algerian border in the west to the Cape Bon peninsula, highlighted in the first close-up. An algal bloom hugs the coastline from the western side of the peninsula to near the capital city of Tunis.

North of the Dorsal is the Tell, a region characterized by low, rolling hills and plains, although in the northwestern corner of Tunisia, the land reaches elevations of 1,050 meters.

The Sahil is a plain along Tunisia’s eastern Mediterranean coast famous for its olive monoculture. The second close-up focuses on an algal bloom off this eastern coast, including the Gulf of Gabès.



Inland from the Sahil, between the Dorsal and a range of hills south of Gafsa, are the Steppes. Much of the southern region is semi-arid and desert. The final close-up shows the Chott el Djerid, a large endorheic salt lake in southern Tunisia.

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.

South of Chott el Djerid, the Grand Erg Oriental desert begins.

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