Sol de Ma?ana is an active geothermal field to the southwest of the Laguna Colorada, It is reminiscent of a small Yellowstone, complete with bubbling mud pots, geysers, and the acrid smell of sulfur, Unlike Yellowstone, however, there are no boardwalks, You are free to walk wherever you wish around this geothermal field but be careful!! The crust is thin and one false step can send you into boiling mud! - Reserva Nacional de Fauna Andina Eduardo Avaroa, Bolivia