出典:Wikipedia
出典:『Wikipedia』 (2011/05/17 18:46 UTC 版)
Opal Pool is a hot spring in the Midway Geyser Basin of Yellowstone National Park, Wyoming. Opal Pool usually has a temperature of approximately 132 °F (56 °C). Though usually active as a hot spring, Opal Pool is considered a fountain-type geyser.