High Quality Content by WIKIPEDIA articles! Lake Natron is a salt lake located in northern Tanzania, close to the Kenyan border, in the eastern branch of Africa`s Great Rift Valley. The lake is fed by the Ewaso Ng`iro River but also by mineral-rich hot springs and is quite shallow, less than three meters (10 feet) deep, and varies in width depending on its water level, which changes due to high levels of evaporation, leaving high levels of salt and other minerals. The surrounding country is dry and receives irregular rainfall. Temperatures in the lake can reach 50 degrees Celsius (120 degrees Fahrenheit), and depending on rainfall, the alkalinity can reach a pH of 9 to 10.5 (almost as alkaline as ammonia).