Bumpass Hell, Lassen Volcanic National Park, California, United States.

This milky-blue water comes directly from a nearby hot spring, one of the many geothermal wonders in Bumpass Hell.

Bumpass Hell is the result of fissures that tap the volcanic heat (which is thought to be a cooling mass of andesite, perhaps three miles below the surface)
It is named after Kendall Vanhook Bumpass, a miner who worked in the Lassen area in the 1860s. K.V. Bumpass discovered the area and was named on a mining claim for the area. In 1865 the editor of the Red Bluff Independent newspaper took a trip with Bumpass to see the locale. During this trip K.V. Bumpass broke though a thin crust above a boiling mud pot, his leg was badly scalded and eventually had to be amputated. The area was named in his honor.