Namafjall is a high-temperature geothermal area, with fumaroles and mud pots, in Iceland. At a depth of 1,000 meters, the temperature is above 200 degrees C. Along with the steam comes fumarole gas, such as hydrogen sulfide, which is responsible for the characteristic hot spring smell in the area. The hot springs produce considerable sulfur deposits. In previous centuries sulfur was mined in Iceland to produce gun powder.