Grand Geyser is a fountain geyser in the Upper Geyser Basin of Yellowstone National Park in the United States. It is the tallest predictable geyser known. It was named by Ferdinand Vandeveer Hayden in 1871.
Location: Upper Geyser Basin, Yellowstone National Park, Teton County, Wyoming
Elevation: 7,329 feet (2,234 m)
Name origin: Named during 1871 Hayden Geological Survey
Coordinates: "Grand Geyser". Yellowstone Geothermal Features Database. Montana State University.