Norris Geyser Basin is the hottest and most unstable series of geysers in Yellowstone Park. Steamboat Geyser, the world's largest geyser, is also located in this area. It erupted only once in a long time. The last eruption was in 2008. It set a record of 380 feet. The geysers in this area are also quite rich in color, including clear blue-green and soft blue-white like milk. Because of its instability, new fountains are produced every year, and old fountains die. There are also some orange or green rivers formed by fungi, which are very beautiful.