Tunisia is situated on the Mediterranean coast and is the northernmost country in Africa. It is bordered by Algeria in the west and southwest and Libya in the south-east. Tunisia, with a total area of 163,610 km2, is the smallest of the nations situated along the Atlas mountain range. Despite its relatively small size, Tunisia has great geographical and climatic 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. North of the Dorsal is the Tell, a region characterized by relatively low, rolling hills and plains. The south of the country is semi-arid steppes that merge into the Sahara desert. A series of salt lakes, lie along the northern edge of the Sahara, extending from the Gulf of Gabes into Algeria. The lowest point is Shatt al Gharsah, at -17 m, and the highest is Jebel ech Chambi, at 1544 metres. 


The northern and central regions of Tunisia are underlain by sedimentary rocks ranging from Permian to Recent and belong to the Atlas structural Domain. Mesozoic and Cenozoic sediments overlying the Saharan Platform are well developed. Northwest Tunisia comprises the Tellian structural Domain which is part of the Alpine orogenic system.