Blesi and Fata geysers at Geysir Hot Springs in Iceland. Blesi, the deep azure blue hot springs at the left is the cooler of the two. It rarely erupts these days. Fata (right), the hotter of the two, still erupts occasionally, producing a diagonal spout that continues for an extraordinarily long period of time. The two are among a collection of geysers and hot springs that lie in a lower temperature geothermal field on the outskirts of a volcanic zone that has not experienced recent volcanic activity. The underlying ground is hot enough to make water boil, but not hot enough to create magma and produce lava flows.