Introduction to the Upper Geyser Basin: The Upper Geyser area covers an area of approximately 2.6 square kilometers and is the place with the highest density of fountains in the world. Famous landscapes include: Old Faithful Fountain, Fountain Mountain, Castle Fountain, Grand Fountain, Daisy Fountain, and Giant , cave fountain, riverside fountain, morning glow pool, black sand, and biscuit basin. Old Faithful Geyser is the birthplace of the Firehold River. Since its discovery in 1870, it has erupted on time 18 to 22 times every day, so it is called "Old Faithful". Another famous scenic spot is the Morning Glory Pool. In the 1880s, it was discovered that it was as beautiful as a morning glory. Later, people threw debris at will, thus shortening the flow and temperature of the geyser.