The Lakes of The Ubari (Awbari) Sand Sea of Fezzan*
Recent archaeological research revealed the existence of several fresh-water lakes, known as palaeolakes, in ancient Fezzan, Libya. Some of these lakes were located in the southern regions of Wadi Irawan, Wadi al-Ajal and the Ubari Sand Sea. The archaeological finds from the area include dark layers of organic matters, shells, hand axes and other Palaeolithic and Neolithic implements and tools which strongly suggested ancient human activity in Fezzan. These lakes were part of a larger network of lakes which have included the legendary nearby Lake Tritonis and Lake Chad among numerous other smaller lakes. Precise dating of the lakes is yet to be confirmed, but current studies, conducted by the Fezzan Project, suggest Pleistocene and Holocene human presence. However, results from Wadi al-Ajal's playas (: which are mud flats with rough surface, cracks and salt encrustation, like the Playa of Germa which represent the lakes just before drying out) indicate these lakes to have disappeared around 3000 years ago. Findings from the lakes also suggest that the impressive sand dunes of the Ubari Sand Sea are at least 100,000 years old. Numerous lakes were thought to have covered the eastern and southern regions of the sea, some of which still exist today, as in the case of Gaberoun (or Gabroun), Umm al-Maa and Maafu, where the land surface intercepts the water table.
The main river systems that fed the giant lake: Tasilli N’Ajjer and Hamada Mangueni. The locations of the current Ubari lakes are situated near the middle of the above lake; probably left over as the mother-lake slowly evaporated away into thin air.
The current Ubari Lakes are a group of about 20 lakes, set amidst the landscape of towering dunes and palm fringed oases of the Ubari Sand Sea. To reach these lakes, tourists usually drive to Sabha, then from Sabha to Tkerkiba, where an excellent camping site is used as the base to explore the lakes as well as Wadi Matkhandouch. The depth of the lakes, according to one Libyan diving centre, varies from seven meters deep (as in Gabroun) to 32 meters deep (Ain al-Dibbanah, near Ghadames). Some of these lakes are slowly drying out, owing to drought and artificial drainage of underground resources! Among the most picturesque of the lakes are Gaberoun and Umm al-Maa (the Mother of Water). Also there are two more beautiful lakes which are rarely visited by tourists. These are: Umm al-H'isan (the Mother of the Horse), also spelt as Oum El Hassan, located north of Gaberoun; and at-Tarhouna, about 11km from Umm al-H'isan.
Lake Gaberoun is one of the largest and
most beautiful lakes of the great sand sea of Ubari;
beautifully set amidst the magnificent sand dunes, with palm trees
on one side and the ruins of the old village on the
other. Most of the lakes of the Libyan interior are highly carbonated,
enabling swimmers to easily float without exerting
any effort. The content of salt is rather high: nearly five
times saltier than seawater. Some of the lakes are
home for a harmless tiny red shrimp-like creatures that thrive
in the shallow waters of the lake, which the Tuareg
grind into a paste and use for making cakes, and which have
earned the local inhabitants the name of 'worm
eaters' (Dawada or Dawwada), and hence the name: Dawada Lakes.
Mandara Lake from above (double click to zoom in).
Umm al-Maa from above
Gaberoun Lake from above
The name Gaberoun is a compound of two names: Gaber (grave) and A'awn (a name). The oasis was the home of an old settlement which has been moved elsewhere. The ruins of their settlement are located on the western shore of the lake (see photo). The temperature of the water is, strangely enough, colder on the surface than it is a foot or two below, where it is noticeably warmer. A tourist camp is located on the northeastern shore of the lake, with a Tuareg shop, selling traditional Berber jewellery and other local crafts.
|
||
Palaeo-Mega-Lakes |
||
|
Links to Related Resources:The Palaeohydrology and Palaeoclimate of Lake Megafezzan: A Giant Palaeolake in the Fezzan Basin, Libyan Sahara:
The ancient palaeolakes of Fezzan (see picture above), discovered in the Wadi Shati region, were first studied by Petit-Maire et al., (1980), and then by Thiedig et al., (2000), White et al., (2001), Brooks et al., (2003) and Drake et al., (in press). Their preliminary conclusion was that Fezzan was a giant closed basin with a very large lake, which scientists named: ‘Lake Megafezzan’, with size estimates range from 76,250 (Brooks et al., 2003) to 150,000 km2 (Thiedig et al., 2000).
|
||
|
Palaeoenvironmental reconstruction in the Sahara Desert:
The web page of Dr Kevin White B.Sc., Ph.D.
Senior Lecturer in Environmental Remote Sensing, from the University
of Reading. Dr Kevin's research involves:
"The use of optical
and radar remote sensing for dryland geomorphology and palaeoenvironmental
reconstruction, with a special focus on aeolian and fluvial processes,
weathering, soils and geochemistry."
|
||
|
Fezzan Project:
The
Fezzan Project: Geoarchaeology of the Sahara: Fezzan Project aims to increase our understanding of ancient Fezzan and southwestern Libya, particularly life and conditions during the Early Stone Age (Palaeolithic), Late Stone Age (Neolithic), Classical, Medieval and Modern periods. Excavations are mainly centred around Old Germa, the legendary capital of the Garamantean civilisation. In 2001 the team has reached pre-Garamantean layers.
|
||
The Sahara Megalakes Project :According to the Sahara Megalakes Project Megafezzan had a maximum lake area of 130,000±7000 km2 and a catchment area of 350,000 km2. There were two more megalakes in addition to this one: Lake Tritonis and Lake Chad, with Megafezzan being the only lake that provides long term record of climate change in the central Sahara.
|
