A " Geyser " is a very convenient form of apparatus for heating a quantity of water in a short time.
The central lake, during the periods of eruption (which are frequent), displays a geyser-like activity.
The geyser district is held as a national domain, the Yellowstone Park.
More than half, including the largest and finest, are in the upper and the lower Geyser basins, near the head of the Madison, here known as the Firehole, river.
Excelsior, the largest geyser, with a crater about 300 ft.
In the lower Geyser basin are the Mammoth Paint Pots, a group of mud springs with colours varying according to the mineral ingredients in the steam, which not only colours the mud but also forms it into imitative figures.
There are hotels at the Mammoth Hot Springs, at the principal geyser basins and at Yellowstone Lake.