老忠实泉 (Old Faithful) is a famous geyser located in 黄石国家公园 (Yellowstone National Park) in the United States. It is known for its predictable eruptions, which occur approximately every 90 minutes. The geyser shoots boiling water and steam high into the air, reaching heights of up to 180 feet. Visitors flock to 老忠实泉 to witness its spectacular displays, making it one of the park's most popular attractions. The surrounding area features a variety of geothermal features, including hot springs and mud pots, showcasing the unique geology of 黄石国家公园.