Reykjavik: Thrihnukagigur Volcano Guided Hiking Day Trip

Thrihnukagigur is not a cave with a clever name. It is a dormant volcano with an empty magma chamber, and you reach it by a slow, secured lift that lowers you about 400 feet into the earth. The approach is just as memorable: a 45 to 50 minute walk over rough lava, with wide views toward Reykjavik, the Reykjanes Peninsula, and Snæfellsnes.

I like the small groups of four to five inside the volcano, which make the descent feel calm rather than crowded. I also like the hot soup waiting at base camp, especially after a wet, windy walk. The catch is simple: at $414, this is a costly half-day, and the mountain weather can turn the hike into a cold, muddy test of patience.

Key points to know

• 120-meter descent: A secured lift takes you into a former magma chamber, slowly and with a helmet and harness.
• Moderate but uneven hike: The walk has limited elevation gain, but rough lava and wet weather demand proper hiking shoes.
• Small groups inside: Parties are split into groups of about four or five for safety and a quieter visit.
• Views before the volcano: The route across the lava field can reveal Reykjavik, Reykjanes, and Snæfellsnes.
• Warm finish: Icelandic meat soup, vegetarian soup, coffee, tea, hot chocolate, and some sweets are served at base camp.
• Weather matters: The mountain can be much colder, windier, and wetter than Reykjavik.

Why going inside Thrihnukagigur feels different

Iceland gives you plenty of ways to see volcanic rock. You can walk over fresh lava, visit a lava tube, or peer into a crater. Thrihnukagigur offers something far stranger: a ride down into the open interior of a dormant volcano.

The chamber is empty because the magma drained away without sealing the passage. That leaves broad walls marked with striking mineral colors. You are not walking through a narrow tunnel. Instead, you descend into a large underground space and look up toward the opening above.

The lift is part of the thrill. You are clipped in, wearing a helmet and harness, and lowered slowly for about ten minutes. It can feel a little wobbly, much like a small elevator, but the pace gives you time to take in the rock walls and the changing view of the opening.

Once below, you can spend up to an hour inside, or leave sooner if the height, cold, or enclosed setting bothers you. Guides remain with you, explain how the chamber formed, and manage the movement of each small group.

The ride from Reykjavik to Bláfjöll

With the optional transfer, pickup begins about 30 minutes before departure. Gray Line operates the Reykjavik pickup service, with stops that cover hotels, guesthouses, and designated city bus stops. The drive to the meeting point takes about 45 minutes overall, with roughly 30 minutes on paved road from Reykjavik to the Breiðabliksskáli ski cabin in Bláfjöll.

The trip begins as a practical transfer, but it soon changes character as the road rises toward the Blue Mountains. You leave the city behind and reach a rough volcanic setting that feels far removed from central Reykjavik.

If you drive yourself, go east on Route 1 for about 15 minutes, then turn onto Route 417, Bláfjallavegur. Continue to the cabin without turning onto the gravel track. You should arrive about ten minutes before the scheduled start.

Do not judge the weather in Reykjavik too quickly. The mountain can have rain, strong wind, snow, and poor visibility while the city looks fairly mild. Several people found waterproof outerwear useful, and the operator has provided full-length raincoats in difficult conditions. Still, bring warm layers and proper shoes rather than relying on supplied clothing.

Crossing the lava field for 45 to 50 minutes

From the cabin, you walk across a lava field toward the volcano. The route is described as moderate, with mostly straightforward walking and only limited elevation changes. The real challenge is the surface, which is hilly, uneven, and sometimes slippery.

You should plan on about 45 to 50 minutes each way. Some descriptions call the total walk roughly two miles, so this is not a quick stroll from the bus to a viewpoint. The pace is steady, and guides keep the group together rather than forcing everyone to hurry.

This approach is valuable because it puts the descent in context. You first see the rough ground that volcanic activity created, then enter one of the features formed beneath it. Along the route, guides explain volcanic activity in Iceland and point out lava formations and tubes.

On a clear day, the walk offers broad views toward Reykjavik, the Reykjanes Peninsula, and the Snæfellsnes Peninsula. In poor weather, those views may disappear. Rain and wind can also make the route much less comfortable than the word moderate suggests.

I would wear sturdy hiking shoes with good grip, warm layers, and waterproof trousers if you have them. Sneakers and jeans are specifically unsuitable. Gaiters could also help in wet weather, based on the practical problem of water finding its way into shoes and trousers.

Base camp, safety gear, and the lift

At the volcano base camp, the staff prepare you for the descent. You receive a helmet and harness, then get a clear safety briefing covering how to behave inside the chamber and how to use the equipment.

The group is divided into smaller parties of about four or five people for the descent. This is one of the better features of the setup. The chamber is unusual enough that you will want space for photographs and a chance to listen to the guide without a large crowd pressing around you.

The lift carries only a small number at a time, reportedly around six people. You are clipped in during the ride. The descent takes roughly ten minutes, which is slow enough to reduce the sense of being rushed and to give you time to see the rock walls.

If you dislike heights, open grating, dark spaces, or lifts, tell the staff before going down. One person who was nervous in caves and dark places found that the guide and lift operator helped them relax. The guides are there throughout, and the safety procedure is not treated as a casual formality.

The ride may feel mildly exposed rather than frightening. You can see the opening above grow smaller as you descend, while the chamber opens around you. That visual change is the heart of the experience.

Inside the colorful magma chamber

At the bottom, the volcano becomes much more than a dramatic photo stop. The chamber shows how molten rock once moved through the mountain, then drained away and left an open space behind.

The colors on the walls are a major reason this visit feels different from a standard lava-tube tour. Depending on light and conditions, you might see strong bands and mineral shades across the chamber. The view back toward the opening is also striking, with daylight reduced to a shape high above.

You can spend up to an hour inside, although the exact time can vary with the group and conditions. A slow pace is encouraged, and you do not need to walk constantly. This matters if you are less confident on rough ground, since much of the experience comes from standing still and looking around.

Photography is a strong part of the visit. The chamber provides unusual angles, contrasting colors, and a view that few other Iceland activities can match. Keep your hands and attention available during the lift and follow the guide’s instructions rather than trying to photograph every second.

A word of caution: the chamber is not an easy, polished attraction. The ground inside is rocky, and some people may prefer to remain near the lift rather than walk around. The tour is not suitable for people with mobility impairments.

The walk back and the soup at base camp

After the chamber visit, you ride back up and walk across the lava field to the cabin. The return walk is another 45 minutes or so, and it can feel longer if the wind has risen or your clothes are wet.

This is where the food service earns its place. At the base camp, you receive traditional Icelandic meat soup or a vegetarian alternative, along with coffee, tea, hot chocolate, water, and some sweets. The soup is especially welcome after the hike and underground visit.

Do not expect a full meal at the earlier hut stop. Hot drinks may be available while you wait, but snacks are not consistently part of that break. If you need food between breakfast and the final soup, carry something small in your day pack.

The warm finish also gives you time to dry off, hear a few final explanations, and regain feeling in your hands before the ride back to Reykjavik. It is a practical touch, not just a decorative extra.

How the weather changes the experience

Weather is the biggest variable here. A calm, dry day gives you easier footing, wider views, and a more relaxed walk. Wind, rain, or snow can make the same route feel like a proper mountain outing.

The operator may discuss cancellation in severe conditions, but you should not assume that bad weather means the trip is automatically off. Some departures have continued through strong wind, driving rain, or snowstorms when the staff judged the route safe.

That can produce memorable drama, but it also means you need the right attitude. You will not get the best views in a storm, and wet clothing can make the return walk unpleasant. The volcanic chamber remains the main attraction, but the journey to it is exposed.

Check the forecast, then pack for conditions worse than those in town. Warm layers, waterproof outerwear, and hiking shoes matter more than a camera or fancy travel outfit.

Is $414 a fair price?

At $414 per person, this is among the most expensive activities you can book from Reykjavik. The price pays for a specialist operation, safety equipment, guides, the lift system, transport if selected, and access to a place you cannot visit independently.

That does not make it a bargain. You could spend the same money on several other Iceland outings. If you are mainly looking for a scenic hike, there are cheaper choices. If you want to enter a former magma chamber by lift, there is no simple substitute in this tour.

I see the value in the rarity and the organization. The guides manage the safety equipment, split groups into smaller parties, explain the volcanic setting, and keep the day moving without making it feel frantic. The soup and drinks are modest additions, but they matter after a wet hike.

The best way to judge the price is to ask yourself how important the underground experience is. If going inside a volcano is one of your main reasons for visiting Iceland, the cost may feel justified. If it is only one item on a long list of optional day trips, the price deserves careful thought.

Who should book this experience?

I would recommend it most strongly to visitors who want an unusual geological experience and do not mind paying for access and specialist handling. It also suits people who enjoy walking, photography, and learning how volcanic features form.

You do not need to be a serious mountaineer. The hike has limited elevation gain, and one older participant with a fairly new hip completed it. Still, you need to manage uneven lava for about 45 to 50 minutes each way.

This is not a good choice if you have a mobility impairment, dislike exposed lifts, or want a gentle sightseeing trip from a warm bus. It is also a poor fit if you plan to wear casual sneakers or travel clothes.

For the best chance of enjoying it, build your day around the tour rather than scheduling something demanding immediately afterward. The advertised duration is four to six hours, and transfers, weather, and group timing can affect the pace.

Booking details worth knowing

Pickup from Reykjavik is optional. If you choose it, be ready in front of your hotel, guesthouse, or assigned bus stop about 30 minutes before departure. If you meet the group at Bláfjöll, arrive at Breiðabliksskáli about ten minutes early.

English and Icelandic guides lead the activity. Guides such as Marcus, Ben, Daniel, and the staff nicknamed Grima 1 and Grima 2 have received especially warm personal praise, though your guide will depend on the departure date.

The activity allows cancellation up to 24 hours before the start for a full refund, and you can reserve now and pay later. Starting times vary, so check availability when choosing a date.

Should you book Thrihnukagigur?

Book it if you want one of Iceland’s most unusual paid adventures and can accept the high price, uneven walk, and uncertain mountain weather. The 120-meter descent into the magma chamber is the reason to come, while the lava-field hike, wide views, safety briefing, and hot soup make the day feel like a complete outing.

Skip it if you only want a low-cost volcano viewpoint, have mobility limits, or feel uneasy about a slow lift into a dark underground space. For everyone else, this is a rare chance to see the inside of a volcano rather than simply looking at one from the outside.

FAQ

How long does the Thrihnukagigur tour take?

The activity lasts about four to six hours, depending on the selected starting time, transfers, walking pace, and group timing.

How far do I walk to the volcano?

The walk from the Bláfjöll cabin to the volcano takes about 45 to 50 minutes. The return walk takes about another 45 minutes.

How difficult is the hike?

The hike is rated moderate. It has limited elevation gain and mostly straightforward walking, but the lava surface is hilly and uneven.

How far down do you go inside the volcano?

You descend about 400 feet, or 120 meters, into Thrihnukagigur’s magma chamber.

How do you enter the volcano?

You enter using a secured lift. You wear a helmet and harness and receive a safety briefing before the descent.

How long do you stay inside?

You can spend up to one hour inside the volcano, or less if you prefer.

What food and drinks are included?

The tour includes traditional Icelandic meat soup or a vegetarian alternative, plus coffee, tea, hot chocolate, water, and some sweets.

Is hotel pickup available from Reykjavik?

Yes. Pickup and drop-off are available from selected Reykjavik hotels, guesthouses, and designated bus stops when that option is chosen.

What should I bring?

Bring good hiking shoes and warm clothes. Sneakers and jeans are not suitable, and mountain weather can differ greatly from conditions in Reykjavik.