Dimensions 100 x 130 feet. Depth 27 feet. Temperature 161°F
The edges of this pool display the color of the rainbow, hence the name.
Algae and cyanobacteria are responsible for the varied colors.
This pool has only erupted a few times in the past.
During one eruption in 1948 it reached a height of 25 feet.
The last known eruption was in 1973.