Ethiopia’s Dallol region combines a salt flat with volcanic hot springs, to wildly colorful effect. Hot rocks far below are forcing up hot salty water, laden with minerals. The bubbling hot springs then form brightly colored salt formations and salty lakes.
The active areas are continually changing, with new features appearing and old ones drying up and fading. The currently active hot spring area is full of lots of little bubblers, 1-3 inches, burbling up colors. The water is hot, but not boiling – most of the bubbles are trapped gas, not steam. There is yellow from sulfur, green from potash, red from iron, white from pure salt.
The colors are much more intense than anything I remember from Yellowstone. They look ridiculously over-saturated! I suspect this is because I’m seeing colored salt, whereas at Yellowstone you see colored limestone. When there is rain (which happens every few years) all the formation and colors are washed away.
It looked extremely cool!