III. PHYSICAL AND VEGETATIONAL ASPECTS OF THE SAHARA
129
Fig. 10. Evolution of the Sebkha-el-Melah. Intermittant lake collecting the highrising waters of the Saoura wadi. Note the white salt deposits on the shore.
Fig. 11. Evolution of the Sebkha-el-Melah. Dried-out lakes "evaporites" or salt
crusts, located at the surface of clayey deposits (polygonal network).
(Table VII) (Monod, 1958; Mission Berliet, 1962; Cornet, 1964; Conrad,
1963).
4. Permanent Pools
One also finds a few, rare, more or less permanent water pools called
guelta in Arabic, and aguelmane in Tuareg. These are generally located
in mountainous massifs. In the mountains of the central Sahara, these
water holes are deep and large, located in the middle of rock formations,
129
Fig. 10. Evolution of the Sebkha-el-Melah. Intermittant lake collecting the highrising waters of the Saoura wadi. Note the white salt deposits on the shore.
Fig. 11. Evolution of the Sebkha-el-Melah. Dried-out lakes "evaporites" or salt
crusts, located at the surface of clayey deposits (polygonal network).
(Table VII) (Monod, 1958; Mission Berliet, 1962; Cornet, 1964; Conrad,
1963).
4. Permanent Pools
One also finds a few, rare, more or less permanent water pools called
guelta in Arabic, and aguelmane in Tuareg. These are generally located
in mountainous massifs. In the mountains of the central Sahara, these
water holes are deep and large, located in the middle of rock formations,