Mudpot

A mudpot, or mud pool, is a type of acidic hot spring, or fumarole, with limited water.

The mud of a mudpot is generally of white to greyish color, but is sometimes stained with reddish or pink spots from iron compounds.

[2] Mudpots form in high-temperature geothermal areas where water supply is short.

The little water that is available rises to the surface at a spot where the soil is rich in volcanic ash, clay, and other fine particulates.

Several locations in and around the Salton Sea in California are also home to active mudpots,[5] including the moving Niland Geyser.