Dallol is a cinder-cone volcano in the Danakil Depression, northeast of the Erta Ale Range in Ethiopia. The area lies up to 120 m (390 ft) below sea level, and has been repeatedly flooded in the past when waters from the Red Sea have inundated it. The Danakil Depression is one of the hottest places on Earth, and the evaporation of seawater after these flooding episodes produced thick deposits of salt, as seen in this landscape. The deposits at Dallol include significant quantities of the carbonate, sulfate and chloride salts of sodium, potassium, calcium and magnesium. Hot springs discharge brine to form the blueish ponds, and small, temporary geysers produce cones of salt.Photograph credit: Alexander Savin
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