Volcanic Caves and Craters: The Lava Tunnel, Grindavík & Reykjanes Lava Fields Combo Tour

Experience the raw power of Iceland’s volcanic landscapes on this full-day adventure, combining the mysterious underground world of lava tunnels with the striking volcanic fields of the Reykjanes Peninsula. From exploring natural lava tubes to walking across rugged lava fields, this tour immerses you in Iceland’s geological wonders, complete with stunning coastal views and geothermal areas. Perfect for adventurers and nature lovers alike! Raufarhólshellir Lava Tunnel Raufarhólshellir, one of Iceland’s longest lava tubes, stretches 1,360 m and offers a spacious, easy walk through stunning volcanic formations. Enter through a narrow opening and journey deeper into the cave, where naturally colored walls shimmer in red, violet, and turquoise from mineral deposits. Along the way, our expert guides share the cave’s history, highlight its most impressive features, and ensure a safe, unforgettable adventure. The tour lasts for approximately 1 hour. You'll then be dropped back in Reykjavík after the tour for some free time before being picked up again for the section half of the tour. Kleifarvatn Lake Once aboard for part 2 of the day, we'll first stop at Kleifarvatn, the largest lake on the Reykjanes Peninsula, just a 30-minute drive from the capital. It is one of Iceland's deepest lakes, with a maximum depth of 318 feet (97 meters). Surprisingly, Kleifarvatn Lake is not connected to any rivers or creeks and is fed only by the groundwater seeping through the porous lava rocks, distinctive to the area. According to the legends, a mythical worm-like monster lives in the deep waters of Kleifarvatn. Your guide will share stories about this mystical creature while you enjoy the views of the vibrant hills and unique lava formations. Seltún Geothermal Area Next, we’ll visit the Seltún geothermal area in Krýsuvík, renowned for its Mars-like landscapes, full of hot springs and vibrantly colored hills that resemble the surface of another planet. The red, yellow, and grey-colored terrain results from the mineral deposits accumulating on the surface. You will notice the distinctive smell of sulfur in the air—evidence of the highly active geothermal processes. We will walk along the wooden paths, discovering multiple bubbling mud pools, steaming fumaroles, and hissing steam vents. Grænavatn Lake After a short drive, we’ll reach another natural masterpiece, Grænavatn, which means “green lake.” This naturally formed pool is nestled in a volcanic crater and is known for the bright green color of its water. This is due to the high concentration of sulfur in the lake. This serene oasis is a perfect spot for photography enthusiasts. Get your camera ready and capture the uniqueness of Iceland's geology! Nátthagi Eruption Site Next up is Nátthagi, the area near the Fagradalsfjall volcano, known as the site of the dramatic eruption in 2021. After being dormant for about 6000 years, the volcano awakened with an explosive event that lasted six months, making it the longest-lasting Icelandic eruption of the 21st century. You will see a large lava field where solidified flows have created striking geological formations, including rounded lumps of black rock at the valley's edge, marking the point where the lava stopped. We’ll be able to take a short hike to the Nátthagi viewpoint to get a closer view of this frozen-in-time lava river. Please note: The hike to the lava field is approximately 20 minutes, but passengers must be comfortable on uneven paths and rugged terrain. Grindavík Town As we reach Grindavík, you’ll be greeted by the eerie silence of a once-thriving town now deeply affected by volcanic activity. Since late 2023, many eruptions in the vicinity have led to road closures and evacuations of the residents, leaving the town empty and deserted. Recently, the town was reopened and declared completely safe for former residents to return and for visitors to explore. However, most of the houses are still abandoned, and the roads still show visible signs of damage from the seismic shifts. This unique opportunity allows us to observe the raw power of Icelandic nature firsthand. Sundhnúkagígar Lava Field Please note: We’ll stop at a local restaurant for 15 to 20 minutes to grab refreshments. Next, we will drive through the Sundhnúkagígar lava field, just outside of Grindavík. This land was shaped by some of Iceland’s most recent eruptions, which captured headlines worldwide. Here, you’ll witness the freshly created volcanic landscape with steam still rising from the ground After exploring this natural masterpiece, we’ll head back to Reykjavik, driving through the picturesque Icelandic countryside and sharing the highlights of an adventure-filled day. We’ll arrive in the early evening, giving you plenty of time to relax or explore the vibrant capital.