Highlights: 
Nestled between the glaciers Eyjafjallajökull, Mýrdalsjökull, and Tindfjallajökull is Þórsmörk (Thor's Valley), a nature reserve in the southern Icelandic highlands. Þórsmörk is one of Iceland's most popular hiking destinations.
Strictly speaking, Þórsmörk is a valley and a mountain range between the Krossá, Þröngá, and Markarfljót rivers. Locals, however, often use the name "Þórsmörk" when referring to a much larger region that is composed of the area between Þórsmörk proper, and the Eyjafjallajökull glacier volcano.
Landscapes and Geology
Contrasting vistas of lush oases and roaring glacier rivers cutting through black desert expanses not only make Þórsmörk unique to Iceland but to the entire world. Parts of the valley are rich with moss, fern, and Birchwood, while jagged mountain ridges and ice-capped peaks crown the horizon.
The valley's climate is warmer and calmer than usual in south Iceland, which often causes Þórsmörk's mountains to be cloaked in a veil of mist that materialises when the warm valley air ascends and mixes with the descending cold breath of the glaciers above.
Activities
Þórsmörk's surrounding hills, slopes and mountains are beset with small valleys and gullies that make for some of Iceland's most astonishing hiking routes. Experienced hikers, therefore, have a wealth of trails to trek, varying in distances and difficulty. In fact, Þórsmörk offers two of the most popular trails in Iceland, the Fimmvörðuháls and the Laugavegur.
Fimmvörðuháls is a 30km trail that takes you into the hills beneath the Eyjafjallajökull glacier volcano and to the volcanic craters Magni and Móði, which are still steaming from the eruption of 2010. The 55 km Laugavegur path takes you from Þórsmörk to the Landmannalaugar geothermal area which is home to an incredible wealth of hot springs and rhyolite mountains of vibrant colours.
Accommodation and How to get there
During winter (October 16th - April 30th) the road into Þórsmörk is impassable. In summer (May 1st - October 15th) a special 4x4 mountain bus runs three times per day from the BSÍ bus terminal in central Reykjavík. Once there you have the choice setting up base in a small hut, a private room, a dormitory or in Þórsmörk's campsite. Please note that the huts, private rooms and dormitories must be booked well in advance.
Geysir is a famous hot spring in Haukadalur valley in South Iceland. Part of the ‘Golden Circle', Geysir gives its name to hot springs all over the world.
Though Geysir itself is hardly active anymore, the area features spectacular hot springs such as the powerful Strokkur, which spouts a vast amount of water every 10 minutes, around 15-20 meters into the air, Smidur and Litli-Strokkur.
North of Geysir are fumaroles, i.e. unlike the hot springs that emit hot water, only steam and gas emanate from these. You may be able to observe bright yellow stains at the fumaroles, this is native sulphur, which crystallizes from the steam. At the southern part of the geothermal area, called Thykkuhverir, you‘ll find various mud pots. Such mud pots are actually fumaroles that boil up through surface water/groundwater and may become steaming fumaroles during dry spells, rather than the usual boiling mud pots.
About 2 km from Geysir is an old preserved natural pool called Kúalaug. One can bathe in it and it has room for 3-5 people at a time, but care should be taken, as the area around the pool is very delicate. The temperature is 39-43°C, depending on how you are positioned in the pool. The water is slightly muddy, as the pool is built on soil, and the bottom is slippery due to algae, so caution is advised.
In Haukadalur there has also been tree planting in recent times and today the forest Haukadalsskógur is one of the largest in South Iceland. Aspen, various types of pine, and other plants have been tried out there and experiments and research continue. We also recommend visiting the tree museum, built in the memory of forester Gunnar Freysteinsson. There are good paths and roads in the forest and the wood is specially designed to accommodate wheelchairs.
Haukadalur has been a church site since ancient time. The current wooden church was last rebuilt in 1938 but the variety and appearance of the church dates back to 1842, making it one of the oldest of its kind in Iceland.
Haukadalur is indeed a historical place. It was settled during the age of settlement and scholar Ari “The Wise“ Thorgilsson grew up there. The first pastoral school in Iceland was also built there.
For accommodation, Hotel Gullfoss is about 7 km from the Geysir area, and closer still is the Hotel Geysir.
Gullfoss (translated to ‘Golden Falls’) is one of Iceland’s most iconic and beloved waterfalls, found on the Hvítá river canyon in south Iceland. The water in Hvítá river travels from the glacier Langjökull, finally cascading 32m down Gullfoss’ two stages in a dramatic display of nature’s raw power.
Because of the waterfall’s two stages, Gullfoss should actually be thought of as two separate waterfalls. The first, shorter stage of the waterfall is 11m, whilst the second stage is 21m. The canyon walls on both sides of the waterfall reach heights of up to 70m, descending into the 2.5km long Gullfossgjúfur canyon (geologists indicate that this canyon was formed by glacial outbursts at the beginning of the last age.)
In the summer, approximately 140 cubic metres of water surges down the waterfall every second, whilst in winter that number drops to around 109 cubic metres. With such energy, visitor’s should not be surprised to find themselves drenched by the waterfall’s mighty spray-off.
Gullfoss makes up a part of the highly popular Golden Circle tour, alongside Geysir geothermal area and Þingvellir National Park.
History
In the early days of the last century, Gullfoss was at the centre of much controversy regarding foreign investors and their desire to profit off Iceland’s nature. In the year 1907, an English businessman known only as Howells sought to utilise the waterfall’s energy and harboured ambitions to use its energy to fuel a hydroelectric plant.
At the time, Gullfoss was owned by a farmer named Tómas Tómasson. Tómas declined Howell’s offer to purchase the land, stating famously “I will not sell my friend!” He would, however, go on to lease Howells the land, inadvertently beginning the first chapter of Icelandic environmentalism.
It was Tómas’ daughter, Sigríður Tómasdóttir, who would lead the charge. Having grown up on her father’s sheep farm, she sought to get the lease contract nullified, hurriedly saving her own money to hire a lawyer. The ensuing legal battle was an uphill struggle; the case continued for years, forcing Sigríður to travel many times by foot to Reykjavík if only to keep the trial moving. Circumstances became so difficult that Sigríður threatened to throw herself into the waterfall if any construction began.
Thankfully, in 1929, the waterfall fell back into the hands of the Icelandic people. Today, Sigríður is recognised for her perseverance in protecting Gullfoss and is often hailed as Iceland’s first environmentalist. Her contribution is forever marked in stone; a plaque detailing her plight sits at the top of Gullfoss.
Restaurant / Cafe
Besides Gullfoss, visitors can enjoy the views from Gullfoss Cafe, a locally run delicatessen that serves a wide variety of refreshments and meals. The menu has options to tantalise everyone’s taste buds; hot soups, sandwiches, salads and cakes. There is also a shop on site where visitors’ can browse and purchase traditional Icelandic souvenirs.
The glacier volcano of Eyjafjallajokull (1651 m) is located at the borders of the South Icelandic highlands. It featured prominently in world news in 2010 when ash from its eruption halted air traffic in Europe.
An ice cap of about 100 km with several outlet glaciers covers the caldera of Eyjafjallajökull that stands at the height of 1651 meters. The diamaeter of its highest crater is around 3-4 km2 wide and the rim has several peaks.
Eyjafjallajokull glacier volcano lies north of Skogar, and to the west of Myrdalsjokull glacier and the massive volcano there; Katla.
Eyjafjallajokull is thought to be related geologically to Katla in Myrdalsjokull and eruptions in the former have often been followed by eruptions in the latter.
The 2010 eruptions
The end of 2010 saw some small seismic activity that gradually increased and resulted in a small eruption in March of 2010, characterized by a flow of alkani-olivine basalt lava.
This first stage lasted until April 12th and created the volcanic craters Magni and Modi at the Fimmvorduhals trail. They are so far Iceland's newest vocanic craters, and still eminate steam with lava glowing under the surface.
However it was the second phase of the eruption that started on April 14th that created the huge ash cloud that rose about 9 km into the skies.
This eruption halted air traffic in Europe for days, and its estimated that as many as 107.000 flights may have been cancelled during the week it lasted.
The ejected tephra measured around 250 million cubic meters. This ash cloud lasted for six days and some more localized disruption continued into May. The eruption was officially declared to be over in October 2010, as the snow on the glacier had ceased to melt.
Future volcanic developments?
Eyjafjallajokull erupted in years 920, 1612 and again 1821-1823.
Its latest eruptions were the two that occurred in 2010.
Future volcanic developments remain unclear. The area is still highly active and can be quite unpredictable. It continues, however, to be closely monitored by The Icelandic Meterological Office.
Thingvellir is one of the most important sites to visit in Iceland for its landscape, history and cultural value.
The Icelandic parliament was founded in Thingvellir in 930 and remained there for centuries.Thingvellir is surrounded by a beautiful mountain range and is the site of a rift valley, marking the crest of the Mid-Atlantic range. Today it is a natural park, listed as a World Heritage Site by UNESCO and considered a vital part of the ‘Golden triangle’ (with Geysir and Gullfoss). Of particular note is the magnificent gorge Almannagja, which marks the eastern boundary of the north American plate and into which the beautiful waterfall Oxararfoss falls.
Other notable attractions within the park include the beautiful lake Thingvallavatn, the largest lake in Iceland, the Silfra fissure, one of the world's top dives, and Gjabakkahellir, one of Iceland's most interesting lava tubes.
Gigjokull is one of two glacier outlets from the glacier volcano Eyjafjallajokull, the other being Steinholtsjokull.
The 2010 Eyjafjallajokull eruption was close to the head of Gigjokull. Gigjokull empties out of the summit crater area at 1600 meters (5249 feet), flows across the ice cap to 1500 meters (4921 feet) and then descends in an icefall down 200 meters (656 ft). Water flowing from Gigjokull enters the Markarfljot river and eruptions in the area have caused great glacier bursts, 2010 being the latest example.
Stakkholtsgja is an up to 100 meters deep and 2 kilometers long canyon in South Iceland.
The canyon is located near the entrance to Thorsmork. It has a narrow riverbed and ends in a beautiful waterfall.
Valahnukur is a mountain in the beautiful Thorsmork valley in South Iceland.
Valahnukur is a popular hiking trail, as it offers a magnificent view of the area, which is one of Iceland's most beloved attractions.
