857-95805 - A blue coloured boiling hot mud pool emanates steam as the sunset colours the sky orange, in Hverarâândor Hverir Geothermal Area at Namaskard Pass, North Iceland.
817-364136 - Boiling mud pools in the geothermal Namaskard Volcanic area, Iceland The area is characterised by boiling mud-bogs and so called solfatoras
29-69 - Blisters measuring about 10 cm across in boiling mud pool, Mud volcano, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America