In alkali lakes (also called soda lakes), evaporation concentrates the naturally occurring carbonate salts, giving rise to an alkalic and often saline lake.
Examples of alkali lakes:
*Alkali Lake, Lake County, Oregon 
*Baldwin Lake, San Bernardino County, California
* Bear Lake on the Utah–Idaho border
*Lake Magadi in Kenya
*Lake Turkana in Kenya
*Mono Lake, near Owens Valley in California
*Redberry Lake, Saskatchewan 
*Summer Lake, Lake County, Oregon
*Tramping Lake, Saskatchewan