The Hengill volcano and the mountain range are located in south-western part of Iceland. It is about 803 m high and covers an area of approximately 100 km sq, and the peak is formed of volcanic ash.
From the copious number of fumaroles and hot springs in the area, it is evident that the Hengill volcano is still active.
The volcano sits on the Reykjanes Peninsula between the south Iceland seismic zone and the western volcanic zone. The volcanic mountain type consists of basaltic fissure vents, small shield volcano type.
Lots of folklore is associated with the region with terrible sagas including the tale of a troll woman named Jóra who is believed to have been lying in wait ready to entrap wanderers and horsemen on the trail of Dyrafjöll mountains but was later killed by a farmer during her sleep.
This folklore is said to have happened on the south side of the mountain range, Hellisheiði plateau, which is covered with lava from the Hengill’s glacial lava flow.
The area around Hengill volcano hosts one of the largest geothermal power plants in Iceland. The plant produces electricity as well as hot water for Reykjavik City. Nesjavellir, what used to be farmland, is a high-temperature area featuring a boundless geothermal steam area. The steam field comes second in size just after Torfajökull geothermal field.
It is known to be the most powerful geothermal source in Europe and possibly the world. The water is transported through a long pipeline of about 25 km to low temperature cities. To power and heat, a city on all natural resource illustrates the intensity of the energy levels in the area surrounding Hengill volcano.