Castle Geyser is a cone geyser in the Upper Geyser Basin of Yellowstone National Park. It is noted for the particularly large geyserite sinter deposits, which form its cone. These deposits have been likened in appearance to a castle.
Location: Upper Geyser Basin, Yellowstone National Park, Teton County, Wyoming
Elevation: 7,333 feet (2,235 m)
Name origin: Named on September 18, 1870 by members of the Washburn-Langford-Doane Expedition