Geyser
Yellowstone is the largest geyser locale, containing thousands of hot springs, and approximately 300 to 500 geysers. It is home to half of the world's total number of geysers in its nine geyser basins. It is located mostly in Wyoming, USA, with small portions in Montana and Idaho. Yellowstone includes the world's tallest active geyser (Steamboat Geyser in Norris Geyser Basin), as well as the renowned Old Faithful Geyser, Beehive Geyser, Giantess Geyser, Lion Geyser, Plume Geyser, Aurum Geyser, Castle Geyser, Sawmill Geyser, Grand Geyser, Oblong Geyser, Giant Geyser, Daisy Geyser, Grotto Geyser, the Fan & Mortar Geysers, & the Riverside Geyser, all in the Upper Geyser Basin which alone contains nearly 180 geysers.
El Tatio
El Tatio is well known as a geothermal field in Chile, and is the largest geyser field in the southern hemisphere with about 8% of all geysers in the world and is (together with Sol de Mañana) the highest geyser field in the world. Only Yellowstone in the United States and Dolina Geizerov in Russia are larger and their geysers are taller than these at El Tatio.
The geothermal field covers an area of at elevations of , and is characterized by fumaroles, hot springs, steam vents known as soffioni and steaming soil. Stronger geothermal activity is located within three discrete areas covering a total of surface, and includes boiling water fountains, hot springs, geysers, mudpots, mud volcanoes and sinter terraces; further, chimneys of extinct geysers have been noted. One of these three areas lies within a valley, the second on a flat surface and the third along the banks of the Rio Salado. The first area offers a notable contrast between the snow-covered Andes, the coloured hills that surround the field and the white deposits left by the geothermal activity. Most geysers of El Tatio are found here and are particularly noticeable in cold weather. A similar landscape exists at the third (lower) area, with the presence of the Rio Salado river adding an additional element to the landscape. The second area is located between a creek and a hill and includes an artificial pool for tourists.