2.5-mile hike along a loop trail amongst the boiling, hissing, and bubbling fumaroles (steam vents) and mud pots of the Hverir geothermal area. From there we followed a steep trail up to the summit of an orange-colored rhyolite Mt. Námafjall. From the summit there was a terrific view of the Hverir geothermal area below in one direction and Lake Myvatn and more steaming fumaroles in the other.