The Secret Lagoon: Iceland's Oldest Geothermal Pool
The Secret Lagoon is a historic hot spring in the small village of Flúðir that offers an authentic Icelandic bathing experience. With natural hot water, bubbling geothermal features, and over a century of history, it makes a great stop when exploring Iceland's Golden Circle.
Key Takeaways
- Located in Flúðir, about 90 minutes from Reykjavík
- Iceland's oldest swimming pool (established 1891)
- Natural hot spring with a constant 38-40°C (100-104°F) temperature
- Less crowded and more affordable than the Blue Lagoon
- Perfect addition to a Golden Circle tour
- Chance to see Northern Lights while bathing (in winter)
What's the Secret Lagoon?
The Secret Lagoon, or Gamla Laugin ("Old Pool" in Icelandic), is Iceland's oldest swimming pool, dating back to 1891. Located in the geothermal area of Hverahólmi near the village of Flúðir, this natural hot spring has served many purposes throughout its history, but today it is the perfect place to relax after a day of exploration around the Golden Circle.
History & Creation
The Secret Lagoon has deep connections to local life. In the early days, it wasn't just for relaxation; it was essential to community life. Locals used the hot water for bathing and washing clothes, while a nearby hot spring called Vaðmálshver was used for laundering wool and linen.
From 1909 to 1947, the pool hosted Iceland's first swimming lessons. After a new public pool opened in Flúðir, the old pool fell into disuse for decades until it was restored and reopened to the public in 2014. Today, it offers visitors a glimpse into traditional Icelandic bathing culture, free from the crowds and luxury amenities of newer and more popular spas.
The pool sits in a small geothermal field with several hot springs, including a miniature geyser called Litli Geysir that erupts every few minutes. The constant flow of fresh hot water means the entire pool's volume is naturally renewed every 24 hours, thus no chlorine is needed.
Location & How to Get There
Getting to this historic pool is straightforward, whether you drive yourself or join a tour. The Secret Lagoon's location makes it an easy stop when exploring Iceland's famous Golden Circle route.
From Reykjavík by Camper (or Car)
Driving from Reykjavík takes about 1.5 hours. The route follows part of the Golden Circle:
- Take the Ring Road (Route 1) east toward Selfoss
- Turn north on Route 35 toward Flúðir
- Follow signs to "Secret Lagoon" or "Gamla Laugin"
The road is paved and well-maintained, so you’ll be able to access it year-round with a regular 2WD vehicle. The facility features a free parking lot located right at the entrance.
By Tour
Many companies offer day tours from Reykjavík that include the Secret Lagoon as part of a Golden Circle tour. These typically include:
- Transportation to/from your accommodation
- Visits to Thingvellir National Park, Geysir, and Gullfoss Waterfall
- A stop at the Secret Lagoon (usually 1-2 hours)
- A guide who provides information about the sites
This option eliminates the need to drive and includes your entry ticket to the lagoon. Tours typically cost between 10,000 and 20,000 ISK, depending on what's included. However, you won’t be able to relax at the Secret Lagoon for as long as you wish.
Public Transport
Getting to the Secret Lagoon by public bus is possible, but not practical for most travelers. Bus connections are limited, especially outside of summer. For budget travelers, renting a vehicle, or even joining a tour, is often more cost-effective than piecing together public transport.
Key Information for Your Visit
Planning ahead ensures you'll have everything you need for a smooth, enjoyable experience at the Secret Lagoon. Here's what you need to know before you go.
Prices & Tickets
As of September 2025, admission prices are:
- Adults (15+): 4,200 ISK (about $30 USD)
- Children (14 and under): 200 ISK
- Seniors (67+) and disabled visitors: 2,950 ISK
I’d recommend booking ahead online, especially during high season (June-August) and on weekends, as the lagoon limits capacity to ensure a pleasant experience for all guests.
Amenities & Features
The Secret Lagoon keeps things simple but comfortable. This is what you will find there:
- The pool itself is about 10 x 15 meters with a natural gravel bottom
- Water temperature stays constant at 38-40°C (100-104°F)
- Changing rooms with showers (mandatory before entering)
- Lockers included with admission
- Small bistro selling drinks and snacks (not hot meals)
- Wooden walkway around the pool to view geothermal features
The changing facilities are clean and modern, though not luxurious. Showers have soap dispensers, and there are hair dryers available.
One unique feature is the mini geyser (Litli Geysir) that erupts every few minutes right next to the pool. The surrounding area has several bubbling hot springs and steaming vents that you can safely observe from the walkway.
What to Bring vs. What's Provided
It’s important to know what to bring before you, so as not to find yourself in an uncomfortable position. Here's a quick guide to what you should bring and what's available on-site.
You should bring:
- Swimsuit (or rent one for 1,100 ISK)
- Towel (or rent one for 1,100 ISK)
- Water bottle (staying hydrated is important)
- Flip-flops for walking between facilities
- Camera (the steamy landscape is photogenic)
In winter, consider bringing:
- A hat you don't mind getting wet (to keep your head warm)
- Extra layers for before/after soaking
The facility provides:
- Lockers
- Showers with soap
- Hair dryers
- Basic food and drinks for purchase
Rental options if needed:
- Towel: 1,100 ISK
- Swimsuit: 1,100 ISK
Weather & Best Time to Go
Timing your visit affects your experience at the Secret Lagoon. Each season offers something different, and considering the weather and crowds can help you choose the best time to soak in the experience.
Summer (June-August)
Summer brings long daylight hours to Iceland, with almost 24 hours of light in June thanks to the Midnight Sun. The temperatures range from 10ºC to 18°C (50-65°F), making the walk between the changing rooms and the pool comfortable. The surrounding landscape is green, which creates a pleasant and pretty view when you’re soaking.
This is the busiest tourist season, so expect more people sharing the pool, especially during midday when tour buses arrive. The lagoon remains open until 8 PM in the summer, giving you plenty of time even if you arrive a bit late.
Winter (October-March)
Winter offers a completely different but equally interesting experience. The contrast between the freezing air (often below 0°C) and the hot water creates a unique atmosphere with steam rising all around you. This is the season when you might see the Northern Lights while you bathe.
The pool is less crowded in winter except during holiday periods, though it closes earlier (7 PM). Darkness comes early, which is also good because you can soak under the stars. The walkways are maintained and ice-free, but bring warm clothes for before and after your dip.
Shoulder Seasons (April-May & September)
Spring and fall offer reasonable daylight hours, moderate weather, and fewer crowds than peak summer. These months provide a good balance between comfortable conditions and a more peaceful atmosphere. You'll also typically find better deals on accommodations and tours during these periods, making it a good choice for budget-conscious travelers.
For the most peaceful experience, regardless of season, aim for weekday mornings right when the pool opens, or late afternoons when day-trippers have moved on. Weekends tend to be busier as locals also enjoy visiting the pool. Your best bet, if you have flexibility with your dates and plans, is to visit on a weekday during the shoulder season.
Things to Do & Places to Visit Nearby
The Secret Lagoon's location in South Iceland puts it within easy reach of numerous other attractions, making it ideal for combining with a day of sightseeing. Here are some highlights worth exploring before or after your soak.
Golden Circle Highlights
- Gullfoss Waterfall (32 km away): Iceland's iconic two-tiered waterfall
- Geysir Geothermal Area (25 km): Home to Strokkur, which erupts every 5-10 minutes
- Thingvellir National Park (54 km): Walk between continental plates and see where Iceland's democracy began
Local Attractions
- Friðheimar Greenhouse Restaurant (11 km): Dine among tomato plants in a geothermal-powered greenhouse
- Hrunalaug (2.5 km): A tiny natural hot spring (much more rustic than Secret Lagoon)
- Flúðasveppir Mushroom Farm (2.5 km): Tour Iceland's largest mushroom farm and taste dishes made with local fungi
- Kerið Crater (40 km): A volcanic crater with a stunning blue-green lake
It’s a good idea to combine the Secret Lagoon with a Golden Circle day trip, either ending or starting their tour with a relaxing soak.
Northern Lights at the Secret Lagoon
One of the most memorable experiences at the Secret Lagoon is seeing the Northern Lights while soaking in the hot water. During winter months (September to March), if skies are clear and aurora activity is intense, you might see the lights overhead from the comfort of the warm pool. This is a lovely spot to see the Auroras because the location of the pool guarantees minimal lighting pollution.
Secret Lagoon vs. Blue Lagoon
Iceland offers several geothermal bathing options, with the Secret Lagoon and the Blue Lagoon being two of the most popular, yet they offer very different experiences.
The Blue Lagoon, located near Keflavík Airport, provides a spa experience with its distinctive milky blue waters. Starting at 9,990 ISK ($81), it features multiple pools, spa treatments, in-water massages, and a restaurant. It's also more crowded and commercial.
Choose the Secret Lagoon if you value authenticity, affordability, and a more intimate setting. Opt for the Blue Lagoon if you prefer luxury amenities and don't mind higher prices and crowds.
Tips for Visiting the Secret Lagoon
Making the most of your visit requires some planning and knowing what to expect. These practical tips will help ensure a smooth, enjoyable experience at Iceland's oldest swimming pool.
- Follow Icelandic bathing etiquette: Shower thoroughly without your swimsuit before entering the pool. This is strictly enforced.
- Protect your hair: The mineral-rich water can be drying. Apply conditioner before or after, and rinse well.
- Remove silver jewelry: The sulfur in the water can tarnish silver quite quickly.
- Don't rush: Plan to spend at least 2-3 hours to fully enjoy the pool and the surrounding geothermal area.
- In winter, wear a hat: Keeping your head warm while the rest of you is in hot water makes for a more comfortable experience.
- Take breaks if needed: If you start feeling lightheaded, step out of the water to cool down and drink some water.
Conclusion
The Secret Lagoon offers a chance to experience Iceland's geothermal wonders without massive crowds or luxury price tags. The combination of natural hot water, visible geothermal activity, and historic significance makes it a top destination in Iceland.
Whether you're ending a day of sightseeing with a relaxing soak, hoping to spot the Northern Lights from the warmth of the pool, or simply seeking a more authentic alternative to the Blue Lagoon, the Secret Lagoon delivers an authentic Icelandic experience.