Exploring Rumbling Reykjanes: A Journey Through Five Geosites

A large part of the Reykjanes region is recognized as a UNESCO Global Geopark, known for its volcanic landscapes and geothermal activity. Among its 55 designated geosites, the Fagradalsfjall and Svartsengi volcanic areas have attracted particular attention following a series of eruptions since 2021.

While the effects of recent eruptions have largely been localized, volcanic activity has affected nearby communities, roads, and access to certain attractions. Iceland's volcanic activity is closely monitored by scientists, and visitors should always check the latest safety information and local conditions before traveling to affected areas. For current updates, visit Visit Reykjanes.

1. The Bridge Between Continents - Where Europe and North America meet

Location: The Bridge Between Continents is located along Road 425, accessible from Keflavík via Road 44. A short walk of approximately 300 meters from the parking area leads to the bridge. Find location details and visitor information on Visit Reykjanes

The Brige Between Continents is a symbolic crossing between the North American and Eurasian tectonic plates, spanning the Álfagjá rift valley on Iceland's Reykjanes Peninsula. The bridge, also known as the Leif the Lucky Bridge, offers visitors a chance to experience one of Iceland's most fascinating geological features.

Iceland lies along the Mid-Atlantic Ridge, where the North American and Eurasian tectonic plates are slowly moving apart at an average rate of around 2 centimeters per year. This movement stretches and fractures the Earth's crust, creating faults, fissures, and rift valleys. Over time, volcanic activity also helps shape the landscape as magma rises through cracks in the crust and occasionally reaches the surface.

How Does a Rift Valley Form?

Rift valleys develop where tectonic plates move apart, gradually stretching and thinning the Earth's crust. As the crust fractures, blocks of rock can sink between faults, creating elongated depressions. Magma may also rise through the weakened crust, producing volcanic eruptions and new lava fields.

These processes have shaped the landscape around the Bridge Between Continents, where visitors can see a visible expression of the geological forces that continue to shape Iceland.

Although the bridge is a symbolic representation of the boundary between two continents rather than the precise dividing line between the plates, it offers a memorable way to experience Iceland's unique position on the Mid-Atlantic Ridge.

Visitors can also explore the geological history of the peninsula at the Duus Cultural House in Reykjanesbær.

2. Reykjanestá: Greeting the North Atlantic Ocean Ridge Ashore

Location: Reykjanestá is situated at the southwestern tip of the Reykjanes Peninsula via Road no 44 and 425. Find parking near Reykjanesviti lighthouse.

Reykjanestá is one of the most dramatic coastal landscapes on the Reykjanes Peninsula, where rugged cliffs, crashing Atlantic waves, lava fields, and volcanic formations reveal the region's geological history. The area marks the southwestern end of Iceland's exposed section of the Mid-Atlantic Ridge, which continues beneath the ocean.

The Mid-Atlantic Ridge is an extensive underwater mountain system formed where the North American and Eurasian tectonic plates move apart. As the plates separate, pressure decreases in the underlying mantle, allowing some of the rock to melt and form magma. This magma can rise through fractures in the Earth's crust, sometimes reaching the surface in volcanic eruptions. Over millions of years, these processes have created new oceanic crust and shaped the landscape of Iceland.

Why Does the Mid-Atlantic Ridge Rise Above Sea Level in Iceland?

Most of the Mid-Atlantic Ridge lies deep beneath the Atlantic Ocean, but Iceland is an exception. Its position above sea level is largely explained by the combined effects of the spreading tectonic plates and an unusually hot region of the Earth's mantle beneath the island, commonly associated with the Iceland mantle plume.

This additional heat contributes to increased magma production, helping build the volcanic landmass that makes Iceland one of the few places in the world where visitors can explore an active mid-ocean ridge on land.

Reykjanestá also offers a glimpse into the peninsula's volcanic past. The nearby Younger Stampar craters were formed during eruptions in the 13th century, part of a period of volcanic activity known as the Reykjanes Fires. Lava fields, volcanic fissures, and eroded crater formations remain visible in the surrounding landscape.

Nearby, the Gunnuhver geothermal area is known for its powerful steam vents, bubbling mud pools, and colorful geothermal deposits. According to local folklore, Gunnuhver takes its name from Gunna, a ghost said to have been trapped in the hot springs by a priest centuries ago.

The surrounding geothermal activity is also used to generate electricity at the nearby Reykjanes geothermal power plant, where steam from deep underground powers turbines. Together, the volcanic formations, geothermal features, and dramatic coastline make Reykjanestá a fascinating place to discover the geological forces that continue to shape Iceland.

3. The Blue Lagoon: Volcanic Wellness In a Dramatic Setting

Location: The Blue Lagoon stands on road no 426 that can be reached form either road no 43 or 425. View location and more information

The Blue Lagoon is one of Iceland's best-known geothermal attractions, famous for its milky-blue waters surrounded by black lava fields. Although partly man-made, the lagoon is closely connected to the area's unique geology. Its mineral-rich geothermal seawater originates deep underground and is brought to the surface through wells associated with the nearby Svartsengi geothermal power plant. The water's distinctive blue appearance is caused by silica suspended in the water.

The lagoon is surrounded by lava fields formed during volcanic eruptions centuries ago, creating a striking contrast between the dark volcanic rock and the pale blue water. Visitors can enjoy geothermal bathing, spa treatments, and other wellness experiences in this remarkable setting.

More recently, volcanic eruptions along the nearby Sundhnúkur crater row have added new lava fields to the landscape, offering another striking example of the geological forces that continue to shape the Reykjanes Peninsula.

4. Fagradalsfjall

Location: Fagradalsfjall is located on the Reykjanes Peninsula, northeast of Grindavík. Visit Reykjanes provides a map of the area with parking and hiking options, along with practical information for visitors.

Fagradalsfjall attracted international attention when volcanic eruptions took place in 2021, 2022, and 2023, ending a long period without eruptions in this part of the Reykjanes Peninsula. The eruptions created new lava fields and craters, offering scientists valuable insights into volcanic processes and giving visitors a rare opportunity to see how Iceland's landscape continues to evolve.

The geology of Fagradalsfjall is characterized by a combination of ancient volcanic formations and newly solidified lava. The contrast between older, weathered landscapes and fresh lava fields illustrates the geological forces that continue to shape Iceland. Visitors can see formations such as lava channels, craters, and vents, along with different volcanic rocks and minerals.

Several hiking trails lead to viewpoints overlooking the lava fields and surrounding volcanic landscape. Routes vary in length and difficulty, and conditions can change. Before setting out, check the latest safety information, prepare for the terrain and weather, stay on marked paths, and never walk on the lava.

5. Seltún: The Geothermal Alchemy of Earth's Palette

Location: Seltún is by road no. 427 and here you can find a map and more information for visiting Seltún.

Important: Always stay on marked paths and viewing platforms at Seltún and other geothermal areas. The ground may appear solid but can be thin, unstable, and extremely hot. Take particular care when visiting with children.

Seltún, part of the Krýsuvík geothermal area, is known for its steaming vents, bubbling mud pots, hot springs, and colorful mineral-rich ground. The geothermal activity is driven by heat from deep underground, which warms groundwater and produces steam that rises through cracks in the Earth's surface.

As hot water and steam interact with the surrounding rocks, they alter minerals and create the striking colors seen throughout the area. Yellow deposits often indicate sulfur, while red and orange tones are associated with iron compounds. White deposits may contain silica or other minerals, and altered clays contribute to the landscape's varied shades.

Wooden boardwalks and marked paths allow visitors to explore the geothermal landscape while protecting its delicate natural features. The combination of steam, vivid colors, and rugged volcanic surroundings makes Seltún one of the most fascinating geothermal sites on the Reykjanes Peninsula.

Nearby attractions include Grænavatn, a small crater lake known for its distinctive green water, and Kleifarvatn, one of Iceland's deepest lakes. The surrounding mountains feature volcanic formations shaped by eruptions beneath glaciers during the last Ice Age, offering another glimpse into the geological history of the peninsula.

Each hue can indicate key elements involved, showcasing nature's alchemy at work:

Yellow and Bright Yellow: These colors often indicate the presence of elemental sulfur, crystallizing near fumaroles and hot springs where sulfur-rich gases cool. The sulfur deposit was historically mined and used for gunpowder production.

White to Pale Blue: Gypsum (hydrated calcium sulfate) and anhydrite (calcium sulfate) contribute to these lighter shades, formed from sulfuric acid reactions with calcium-bearing materials.

Green and Blue-Green: Copper minerals, when present, can imbue the ground with green hues, while certain silicates and clays may also exhibit various shades of green depending on their composition.

Red, Orange, and Rust: Iron compounds, including oxides and hydroxides, paint the earth in warm tones. These minerals form through the oxidation of iron-bearing fluids or rocks, adding a striking contrast to the landscape.

Bright Whites: Gypsum and anhydrite appear as brilliant white, where silica-rich waters have deposited layers over time.

Pinks and Purples: The less common alunite may add pinkish hues to the sulfatarra palette, indicative of the acidic soils enriched with potassium and aluminum.

Wooden boardwalks and paths have been constructed to allow visitors to explore the area safely without damaging the delicate natural environment or risking injury from the hot and unstable ground. Information signs are typically present to educate visitors on the geothermal processes at work.

Nearby, you can also see Grænavatn, a small but vibrant green crater lake, along with several smaller explosion craters. The larger Kleifarvatn lake, set in a valley between the mountain ridges of Sveifluháls and Brennisteinsfjöll, adds to the scenic variety of the area. These ridges are a phenomenon in fissure eruptions during the last Ice Age. They are predominantly made up of hyaloclastite, or tuff, a brownish type of rock formed from explosive eruptions under ice. Such eruptions, known as phreatomagmatic, happen when ascending magma encounters water and ice, causing powerful explosions that shatter the magma into volcanic ash. This ash accumulates, solidifies, and transforms into rock. Near Kleifarvatn lake, pillow lava formations can also be observed at the bottom, near the lakeshore. These are the result of similar eruptions occurring under higher pressure, leading to their distinctive, bulbous shapes that resemble rose petals.