Discover the Longest Swimming Pool in the World: San Alfonso del Mar

Let's cut to the chase. The title of world's longest swimming pool belongs to one place: the colossal lagoon at the San Alfonso del Mar resort in Algarrobo, Chile. It's not just a pool; it's a 1,013-meter (3,324-foot) long, crystal-clear saltwater marvel that holds a Guinness World Record. Forget what you know about hotel pools. This is a turquoise-blue artery weaving through a private resort, so big it has its own currents and requires small boats for maintenance. If you're imagining a simple lap pool stretched to absurd lengths, think again. This guide will walk you through exactly what it is, how to experience it, and the practical details most articles gloss over.

Your Quick Guide to the World's Longest Pool

Where is the World's Longest Swimming Pool Located?
How to Get to San Alfonso del Mar?
Practical Info: Tickets, Access & Best Time to Visit
What's It Actually Like? The Pool Experience Decoded
How Does It Compare? Other Giant Pools Around the World
Your Burning Questions Answered (FAQ)

Where is the World's Longest Swimming Pool Located?

You'll find this engineering wonder at San Alfonso del Mar, a private resort complex about 100 kilometers (62 miles) west of Santiago, Chile. The exact address is Av. San Alfonso 172, Algarrobo, Valparaíso Region. It sits right on the Pacific Coast, but here's the twist: the pool uses filtered and treated seawater, not chlorinated freshwater. The location is key. Algarrobo is a popular summer getaway for wealthy Santiago residents. The area is known for its mild climate and coastal scenery, but the pool itself is the undisputed star.

The project was completed in phases, with the final staggering length achieved in 2006. The motivation wasn't just a record. The Chilean coast here can have rough surf and cold water. The lagoon was designed to create a perfect, safe, swimmable turquoise environment regardless of the ocean conditions just meters away. It holds an estimated 250 million liters of water. To put that in perspective, it's about 6,000 times the volume of a standard backyard pool.

Key Location Fact: The pool is part of a private resort. This is the most critical detail for visitors. You cannot just walk up and buy a day pass like a public water park. Access is primarily for resort guests or through specific, limited agreements with nearby hotels. More on that in the access section.

How to Get to San Alfonso del Mar?

Getting there requires a bit of planning, especially if you're not staying on-site. Santiago is your gateway.

From Santiago International Airport (SCL)

The most straightforward way is to rent a car. The drive takes about 1.5 to 2 hours via Route 68 and then the coastal route. It's a scenic drive, and having a car gives you flexibility in the Algarrobo area. Parking is available at the resort for guests.

If you don't drive, you have a couple of options, but they're less direct. You can take a taxi or a pre-booked private transfer from Santiago. This is pricey but convenient. There are also bus services from Santiago's main bus terminals (like Terminal Alameda) to Algarrobo. From the Algarrobo bus stop, you'd need a local taxi to reach the resort gates, which are a few kilometers away.

Here's a pro tip many miss: Traffic on Friday evenings and Sunday evenings from Santiago to/from the coast can be horrendous. If you're driving, plan your travel outside peak summer weekend rush hours.

Practical Info: Tickets, Access & Best Time to Visit

This is where dreams meet reality. Access is controlled.

For Resort Guests: If you are staying at San Alfonso del Mar (you're renting an apartment or own one), pool access is included. The resort is essentially a series of privately-owned apartments available for rent.
For Non-Guests: This is tricky. The pool is not a public attraction. Occasionally, some nearby hotels (like the Hotel San Alfonso del Mar next door) might have negotiated access for their guests as part of a package. You must confirm this directly with your hotel before booking. Do not assume. There is no general admission ticket booth.
Day Passes: As of my last visit and research, genuine day passes for the general public are not offered. Any website claiming to sell them should be contacted directly for verification—it's likely outdated info.

Best Time to Visit

The Chilean summer (December to March) is peak season. The weather is warm and perfect for swimming. However, this is when the resort and pool are at their busiest. For a better balance of good weather and slightly fewer people, aim for the shoulder months of November or late March. The water might be a touch cooler, but the experience is more relaxed. Winter (June-August) is quiet but too cold for swimming.

What's It Actually Like? The Pool Experience Decoded

Okay, you're in. What now? The pool is the resort's central nervous system. It's not one continuous lane. It's more like a meandering river with different sections, depths, and vibes. Near the apartments, you'll find shallower areas perfect for families with kids. Other sections are deeper, suitable for casual swimming or just floating.

You won't find Olympic-style lane markers. This isn't a place for serious lap swimmers trying to beat a personal best. The water is calm, clean, and a stunning shade of blue thanks to the filtration system. The bottom is a light-colored material that enhances the color.

What can you do? Swim, float, relax. There are areas with sun loungers. Some sections have bridges crossing over it. You can walk along a significant portion of its edge. For dining, there are restaurants and bars within the resort complex where you can grab a meal or a drink with a view of the water.

My personal take? The sheer scale is breathtaking for the first hour. After that, it settles into being a fantastic, huge, and very beautiful resort pool. The real magic is in that initial "wow" factor and the constant visual appeal it adds to the entire property.

How Does It Compare? Other Giant Pools Around the World

San Alfonso del Mar holds the record for length. But other pools compete in area, volume, or luxury. Here’s a quick comparison to add context.

Pool Name	Location	Key Metric	Notable Feature
San Alfonso del Mar Lagoon	Algarrobo, Chile	Length: 1,013 m (3,324 ft)	Guinness Record holder for longest pool; uses filtered seawater.
Citystars Sharm El Sheikh Pool	Sharm El Sheikh, Egypt	Length: ~700 m (2,297 ft)	A very long runner-up, part of a holiday resort.
Piscine des Marquisats	Annecy, France	Length: 300 m (984 ft)	One of the longest public outdoor pools in Europe, in a stunning lakefront setting.
The Crystal Lagoon at Dreams	Los Cabos, Mexico	Area: ~4.5 acres	Massive in surface area, part of a resort complex with a sandy beach entry.
Nemo 33 (former record)	Brussels, Belgium	Depth: 33 m (108 ft)	Holds the record for the world's deepest diving pool, a totally different category.

The takeaway? Chile's pool is in a league of its own for distance. The Egyptian pool is a distant second. If you're looking for a massive, swimmable body of water within a resort, these are the main contenders.

Your Burning Questions Answered (FAQ)

Is the San Alfonso del Mar pool actually swimmable for its entire length?

Technically, yes, you could swim from one end to the other. But in practice, no one really does that as a continuous lap. It's over a kilometer long—that's an Olympic-level distance. The pool is designed for leisure, not for marathon training. People swim in sections, relax, and enjoy different areas. There are also walkways and bridges that break up the continuous swimming path.

How much does it cost to visit the world's longest pool?

There's no single "pool ticket" price. The cost is bundled into your accommodation. Renting an apartment at San Alfonso del Mar for a week in peak season can run into thousands of dollars, depending on size and view. If you're accessing via a nearby partner hotel, the cost is part of your room rate. The expense is significant, positioning it as a luxury or special vacation destination rather than a casual day trip.

Is it worth planning a trip to Chile just to see this pool?

If your sole goal is to tick "see the longest pool" off a list, probably not, given the access hurdles. However, if you're planning a trip to Chile—exploring Santiago, the wine valleys, and the coast—and you want a unique, luxurious beach resort experience for a few days, then San Alfonso del Mar is a fantastic choice. The pool is the stunning centerpiece of that experience. Think of it as a major feature of a destination, not the destination itself.

What should I pack or know before going to swim there?

Standard swimwear and sunscreen are obvious. Less obvious: the water is saltwater (treated), so it's gentler on the skin and eyes than heavily chlorinated pools, but you might want goggles if you're sensitive. Bring poolside footwear, as the concrete can get hot. Since it's a private resort, the atmosphere is generally calm and upscale—loud music or rowdy games are uncommon. Pack a good book and a mindset to relax.

Can you see the pool from outside the resort if you can't get in?

You can catch partial, distant glimpses from certain public roads or the beach adjacent to the resort, but you won't get a sense of its scale or beauty. The resort is designed for privacy. The best views are from within the property or from the air (some flight paths into Santiago might pass near the coast). Don't expect a satisfying view from the street.

So, there you have it. The world's longest swimming pool is a feat of engineering and a unique travel experience, but it's wrapped in the practicalities of a private, high-end resort. It's less of a public tourist attraction and more of the ultimate amenity for a specific kind of vacation. If you can make the access work, standing on the edge of that immense, blue ribbon of water is a moment you won't forget. Just manage your expectations, plan ahead, and focus on the overall Chilean adventure, with this record-holding pool as a spectacular highlight.