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Lake Natron

Lake Natron is a salt and soda lake in the Arusha Region of northern Tanzania. The lake is close to the Kenyan border and is in the Gregory Rift, which is the eastern branch of the East African Rift. The lake is within the Lake Natron Basin, a Ramsar Site wetland of international significance. The lake is fed principally by the Southern Ewaso Ngiro River, which rises in central Kenya, and by mineral-rich hot springs. It is quite shallow, less than three metres deep, and varies in width depending on its water level. The lake is a maximum of 57 kilometres long and 22 kilometres wide. The surrounding area receives irregular seasonal rainfall, mainly between December and May totalling 800 millimetres per year. Temperatures at the lake are frequently above 40 °C . High levels of evaporation have left behind natron and trona . The alkalinity of the lake can reach a pH of greater than 12. The surrounding bedrock is composed of alkaline, sodium-dominated trachyte lavas that were laid down during the Pleistocene period. The lavas have significant amounts of carbonate but very low calcium and magnesium levels. This has allowed the lake to concentrate into a caustic alkaline brine. The alkaline water in Lake Natron has a pH as high as 10.5 and is so caustic it can burn the skin and eyes of animals that arent adapted to it. The waters alkalinity comes from the sodium carbonate and other minerals that flow into the lake from the surrounding hills. And deposits of sodium carbonate — which was once used in Egyptian mummification — also acts as a fantastic type of preservative for those animals unlucky enough to die in the waters of Lake Natron. Despite some media reports, the animal didnt simply turn to stone and die after coming into contact with the lakes water. In fact, Lake Natrons alkaline waters support a thriving ecosystem of salt marshes, freshwater wetlands, flamingos and other wetland birds, tilapia and the algae on which large flocks of flamingos feed. Now, photographer Nick Brandt has captured haunting images of the lake and its dead in a book titled "Across the Ravaged Land" . Brandt discovered the remains of flamingos and other animals with chalky sodium carbonate deposits outlining their bodies in sharp relief. "I unexpectedly found the creatures — all manner of birds and bats — washed up along the shoreline of Lake Natron," Brandt wrote in his book. "No one knows for certain exactly how they die, but … the water has an extremely high soda and salt content, so high that it would strip the ink off my Kodak film boxes within a few seconds." "I took these creatures as I found them on the shoreline, and then placed them in living positions, bringing them back to life, as it were," Brandt wrote, referring to the way he repositioned the animals. "Reanimated, alive again in death."

Lake Eyasi

Lake Eyasi is a seasonal shallow endorheic salt lake on the floor of the Great Rift Valley at the base of the Serengeti Plateau, just south of the Serengeti National Park and immediately southwest of the Ngorongoro Crater in the Crater Highlands of Tanzania. The lake is elongated, orientated southwest to northeast, and lies in the Eyasi-Wembere branch of the Great Rift Valley. The principal inflow is the Sibiti River, which enters the southwestern end. The river may continue to flow somewhat year round, at least in wetter years; the other inflows are all seasonal. The second largest inflow is the Baray, at the northeast. The water carried by the Baray has increased in recent years due to deforestation of the Crater Highlands. The southwest flank of Mount Oldeani, one of the Ngorongoro volcanos, drains directly into the northeast end of the lake. Flow from the Budahaya / Udahaya River, which drains into the Yaeda Swamp to the southeast of the lake, was once second, but has decreased due to water diversion in the Mbulu Highlands. Water flow from the Serengeti is minor; the largest stream is the Sayu. Seasonal water level fluctuations in the lake are dramatic, though the northwestern shore is constrained by the cliffs of the Serengeti Plateau. During the dry season the lake may dry up almost entirely, especially in drier years, so that Datooga herders and Hadza foragers will cross the lake on foot, but in El Niño years it may flood its banks and attract hippopotamus from the Serengeti. It is a seasonal stop for migrating flamingos. The lake supports minor local fishing in wet years, but more often catfish and lungfish are taken from the streams and springs that feed the lake. Even during wet periods, lake depths typically remain less than one metre. The Hadza are the indigenous inhabitants of the lake. They are found along most of the perimeter, though camps are few along most of the Serengeti, which is Maasai territory. The Datooga inhabit the Yaeda Valley to the southeast, the Isanzu the south, and the Sukuma across the Sibiti River in the southwest. The Iraqw traditionally lived on the other side of Yaeda, but have come in increasing numbers to the Baray, which is now the primary onion-growing region of East Africa. Mumba Cave is an archaeological site that is located by the shores of Lake Eyasi. The site has yielded a number of Middle Stone Age and Late Stone Age artifacts.

Olduvai Gorge

Olduvai Gorge, or Oldupai Gorge, in Tanzania is one of the most important paleoanthropological sites in the world; it has proven invaluable in furthering understanding of early human evolution. A steep-sided ravine in the Great Rift Valley that stretches across East Africa, it is about 48 km long, and is located in the eastern Serengeti Plains in the Arusha Region not far, about 45 km, from Laetoli, another important archaeological site of early human occupation. The British/Kenyan paleoanthropologist-archeologist team Mary and Louis Leakey established and developed the excavation and research programs at Olduvai Gorge which achieved great advances of human knowledge and world-renown status. Homo habilis, probably the first early human species, occupied Olduvai Gorge approximately 1.9 million years ago ; then came a contemporary australopithecine, Paranthropus boisei, 1.8 mya, and then Homo erectus, 1.2 mya. Homo sapiens is dated to have occupied the site 17,000 years ago. The site is significant in showing the increasing developmental and social complexities in the earliest humans, or hominins, largely as revealed in the production and use of stone tools. And prior to tools, the evidence of scavenging and hunting—highlighted by the presence of gnaw marks that predate cut marks—and of the ratio of meat versus plant material in the early hominin diet. The collecting of tools and animal remains in a central area is evidence of developing social interaction and communal activity. All these factors indicate increase in cognitive capacities at the beginning of the period of hominids transitioning to hominin—that is, to human—form and behavior.

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