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The best Geothermal areas in South Iceland. 

Geysir Geothermal area
One of the greatest natural attractions of Iceland and part of the famous "Golden Circle Tour," The Great Geysir, or Stori-Geysir, has been dormant since 1916 when it suddenly ceased to spout. It came to life only once in 1935 and quickly went back to sleep. Since then, its repose has sporadically been disturbed by the dumping of tons of carbolic soap powder into its seething orifice to tickle it to spout.  It is not exactly known when Geysir was created. It is believed that it came into existence around the end of the 13th century when a series of strong earthquakes, accompanied by a devastating eruption of Mt. Hekla, hit Haukadalur. In this geothermal valley, Geysir is located. What is known is that it regularly spouted every third hour or so up to the beginning of the 19th century and, after that, progressively at much longer intervals until it completely stopped in 1916. Whether its silence is eternal or temporary, no one knows.  When it was alive and shooting, it could thunderously blast a spectacular jet of superheated water and steam into the air as high as 60 to 80 meters, according to different sources. Its opening is 18 meters wide and its chamber 20 meters deep. One reason for cessation is believed to be the accumulated rocks and foreign objects thrown into it by thousands of tourists throughout the years. Though definitely damaging, this could not be the only reason for its dormancy.  The Great Geysir was among the most notable geysers in the world, such as those in Yellowstone Park, New Zealand, and North Iceland. The English word "geyser" is derived from the Icelandic word "geysir," which means gusher. Though the Great Geysir itself is now more or less inactive, the area surrounding it is geothermically very active with many smaller hot springs.  The attraction of the area is now Strokkur (The Churn), another geyser 100 meters south of the Great Geysir, which erupts at regular intervals every 10 minutes or so, and its white column of boiling water can reach as high as 30 meters. The whole area is a geothermal park sitting on top of a vast boiling cauldron. Belching sulfurous mud pots of unusual colors, hissing steam vents, hot and cold springs, warm streams, and primitive plants can all be found here.  A short distance away to the west stands the small Laugarfjall Mountain with a panoramic view overlooking the Geysir area. King Christian IX of Denmark visited the area in 1874 and by the foot of the mountain are the rocks where he leaned while his hosts tried to impress and amuse him by boiling eggs in the hot springs. The rocks are now called Konungssteinar ("The King's Stones").
Reykjadalur valley
Reykjadalur valley is the most popular and arguably the most beautiful hiking area in Ölfus. Hot springs and colorful areas full of geothermal activity entertain along a hiking trail that leads to a hot river. For some of the river's length, the temperature is perfect for bathing, and that's a wonderful natural experience. The trail by Reykjadalur can be closed, so it's good to check the conditions before going. To check whether the valley is open or closed to visitors, check out the website of Safetravel.is. Those who plan on visiting the valley need to respect the rules and stay on the paths. Please help us to protect the fragile vegetation around the area!  
Geothermal area in Hveragerði
Inside the town of Hveragerði is an area of hot springs from which the community derives its name (hver = hot spring). The hot springs of Hveragerði are among the most remarkable natural attractions of south Iceland. Visitors to the Geothermal Area can learn about geothermal energy and the springs, which include Eilífur, a geyser that erupts regularly, and Ruslahver, which has an interesting history. You can also boil an egg in the area and try the hot spring bread. "        For opening hours, please visit our Facebook page https://www.facebook.com/Geothermalpark/ Telephonenumber: +354 4835062
Kerlingarfjöll Mountains
The mountain massif Kerlingarfjöll (The Giantess Mountains; 800 - 1500 m) is the main ornament in the chain of mountains and glaciers framing the Kjölur area. It covers about 150 km² area southeast of The Temple Glacier (Hofsjökull)  It derives its name from a single, 25 m high and dark hyaloclastite pillar protruding from the light-colored, rhyolite scree of the peak Kerlingartindur. The aforementioned types of rock represent the main structure of the mountain massif and this yellowish tint is the dominant color in the area.The area is full of small steaming hot springs, mud pools, and water fountains. It is truly a hiker's paradise. It is one of the largest geothermal areas in all of Europe and there are future plans to construct a large geothermal steam plant here for electricity to harness the massive amounts of energy stored here. The area is very unique, sensitive, and beautiful - why such a decision may be controversial if proper conservational steps are not taken when doing so.It is recommended to use 4wd vehicles because of the various and changing condition of the tracks and unbridged rivers, which have to be forded with the greatest of care. It is also recommended that people read the special brochure on driving in the interior before heading up there and remember, that off-road driving is strictly forbidden. Many of those who have visited the interior catch the bug and the only remedy is to come back again and again. It is like an incurable disease. Traveling across the interior was common during the Saga period, but after that up to the middle of the 18th century, superstition kept people away. Nowadays - more and more people enjoy this part of the country the whole year-round. The small glacier patches up there have been retreating fast and now the summer skiing school, which was operated for decades, exists no more. Its complex of houses is now being used to accommodate travelers in the area during the summer months.