This part of the hot center is a field of geothermal activity, including geysirs, steam vents, mud pots, and mineral-rich hot pools. Named for the two adjacent and large prismatic thermal pools whose fluorescent organisms have colored them like iridescent irises that glare from the the unstable, hot earth. One massive geysir erupts daily (but never at a predictable time), gushing countless gallons of scalding hot water from the Rift’s heart. A sulphurous odor clings to this area, and the brittle soil is volatile, often breaking into new hot pools or exploding with hot steam.