In geology , a depression is a landform sunken or depressed below the surrounding area. Depressions form by various mechanisms.
3-589: The Mourdi Depression is a prominent desert depression of northeastern Chad . It lies adjacent to the Ennedi Plateau . The cleft lies "between the Erdi plateau and the eastern slopes of Ennedi, and the mouth of the Wadi Guroguro." The depression is characterized by a rocky valley, about 30 miles (48 km) wide from north to south, sloping from an altitude of about 1,800 feet (550 m) down towards
6-495: The Mourdi Depression, and the nearest major town is Fada to the southwest. Small barchans are noted here. The depression is cited as one of the most important Saharan grazing-grounds. There are numerous rock paintings in the area. The depression was explored by R. A. Bagnold , a pioneer in desert explorations in 1932. During this first motorized expedition in 1932, he found implements on the northern scarp, dated to
9-480: The west to Djourab . The Mourdi Depression lies along a trading route from Abéché to Kurfa ; this route passes Tiné , then veers north to Bao , before passing through the Mourdi Depression and Erdi Ma . The Mourdi Depression is also along a fisherman's route for reaching the northeast of Lake Chad by traveling through the Erdi Plateau and Ennedi gap via the depression. The Wadi N'kaola in situated within
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