Lake Bogoria geyser ... Lake Bogoria sits in a depression in Kenya's rift valley surrounded by hills. The rift valley is a hotbed of vulcanism and there are numerous geysers around the shores of the lake. The lake itself receives water from a number of small rivers and from volcanic fumaroles. The water perculates through the rocks where it picks up salts such as sodium carbonate. The lake has no outlet but water is lost through intense evaporation which effectively concentrates the dissolved salts creating saline soda-rich water that favours intense blooms of cyanobacteria almost to the exclusion of everything else.
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