Old Faithful, e.g. is a GEYSER, which is a type of hot spring that periodically ejects a column of hot water and steam into the air. Geysers are usually found in areas of high geothermal activity, such as near volcanoes, and Old Faithful is one of the most famous geysers in the world. It is located in Yellowstone National Park in the United States and is known for its predictable eruptions, which occur every 44 to 125 minutes.