Old Faithful Geyser is the most famous sight in Yellowstone Park in the United States. The most famous geyser in Yellowstone is Old Faithful. It does not erupt irregularly like other geysers. It erupts every few dozen minutes and never disappoints tourists. Its unfailing fidelity has endeared it to the world. The Old Faithful fountain sprays out every 56 minutes, each time lasting about 4 minutes. The highest and most beautiful spray is in the first 20 seconds. Each time it sprays a total of about 10,000 gallons of hot water, with a height of 40-50 meters, and the water temperature is Celsius 93 degrees. Through winter and summer, the Old Faithful Fountain keeps spraying according to a certain pattern, earning it the reputation of "Old Faithful". When people come to Yellowstone Park, they must take a look at Old Faithful Fountain. But when you see it not spraying, it is like a galloping horse. When the sun shines, the water vapor flashes out in colorful colors, which is so spectacular that no one can help but sigh in admiration.