The water in these lakes is not only salty, but also strongly alkaline, making it harmful to most plants and wildlife.
The minerals often come from nearby hot springs, river water and ancient lava-rich bedrock. In hot environments with low and inconsistent rainfall, large shallow lakes can slowly shrink in size and become very salty as their mineral-rich waters evaporate and leave behind high concentrations of dissolved salts. So how do these lakes form if they aren’t a result of seawater? At the bottom, just to the left of the centre of this photo, is Lake Natron in Tanzania. Lake Natron, in northeastern Tanzania near the Kenyan border, is an example of a soda lake - a very salty lake that was once a freshwater lake.
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