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Lake Natron is a salt lake located in northern Tanzania, close to the Kenyan border, in the eastern branch of the East African Rift. The lake is fed by the Southern Ewaso Ng'iro River and also by mineral-rich hot springs. It 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 concentrations of salt and other minerals, notably sodium carbonate (natron).

Monastic dormitories stand on the hillside at the Serthar Wuming Buddhist Study Institute on November 4, 2006 in Serthar County of Garze Tibetan Autonomous Prefecture, Sichuan Province, China. The Wuming Buddhist Study Institute is located in Larung Gar Monastery on an altitude of 3,700 meters (about 12,136 feet). The institute has the largest conglomeration of monks and nuns in Tibetan Areas, with over 40,000 monastics from the Tibet Buddhism Nyingma School, Gelug School, Sakya School and Kagyu School, including more than 10,000 nuns. (Photo by China Photos/Getty Images)

Local villagers prepare to bury the body of elephant Hemantha during a religious ceremony at a Buddhist temple in Colombo March 15, 2016. Elephant Hemantha, which died from injuries to its feet, was under medical treatment for the last six months. The elephant used to march at street parades during festivals held by the temple. Elephant Hemantha died at age 23. Wild elephants have long lifespans, reaching 60–70 years of age. (Photo by Dinuka Liyanawatte/Reuters)

A family of baby brown bears appear to be dancing to Ring a Ring o' Roses as their mother relaxes behind a tree nearby. At just a few months old, two young males and one female gather in a circle, clutch each others' hands and begin to dance to the popular nursery rhyme. It's almost like a scene from a school playground as the bears joyfully play together, tapping their feet and moving around in a circle. (Photo by Valtteri Mulkahainen/Solent News & Photo Agency)

Cotswold gamekeeper shoots amazing pictures of British wildlife – without the aid of long lenses and elaborate techniques. The photos may look like they have been shot from miles away – but amazingly Adam Tatlow is actually just feet away from his wild subjects. Photo: Young fawn shelters in the wood. He is so at one with nature that he knows how to call animals to him, and often gets within 30ft of them. (Photo by Adam Tatlow/BNPS)

The Aletsch Glacier is pictured at dusk in Fiesch, Switzerland, August 11, 2015. One of Europe's biggest glaciers, the Great Aletsch coils 23 km (14 miles) through the Swiss Alps – and yet this mighty river of ice could almost vanish in the lifetimes of people born today because of climate change. The glacier, 900 metres (2,950 feet) thick at one point, has retreated about 3 km (1.9 miles) since 1870 and that pace is quickening. (Photo by Denis Balibouse/Reuters)