Laguna de Río Cuarto is a volcanic crater lake so perfectly circular it looks drawn with a compass. Approximately 400 meters in diameter, surrounded by dense tropical forest, and filled with deep emerald-green water, it's one of the most visually striking natural sites in Costa Rica's Northern Zone, and one of the least visited by foreign tourists.
The lake sits in the Río Cuarto district of Alajuela Province, roughly halfway between Bajos del Toro and La Fortuna. It's deep (estimated 60+ meters), volcanic in origin, and provides a completely different experience from the waterfalls that dominate the region. Where Bajos del Toro is about dramatic cascades and turquoise pools, Laguna de Río Cuarto is about calm water, forest silence, and the strange beauty of floating above an ancient volcanic vent.
Quick Facts
- Location
- Río Cuarto canton, in the northern Alajuela highlands, about 1.5–2 hours from San José via Route 126, with a final gravel section.
- Best Time to Visit
- Year-round, best December to April
What to Expect
What You'll Find
The Lake
The main attraction is the lake itself. Approaching from the access road, you first see it from an elevated viewpoint, the symmetry is startling. A nearly perfect circle of green water set inside a ring of forest, with no development on the shores.
At water level, the experience shifts to intimacy. The forest comes right to the edge. The water is calm (no river current, it's a closed crater). The color ranges from emerald to dark green depending on depth, angle, and light. On clear mornings, the surface reflects the surrounding trees like a mirror.
Activities
Kayaking, The primary activity. Single and double kayaks are available for rental, allowing you to paddle across the crater lake. The distance is manageable (400 meters across) and the water is flat. Paddling to the center of the lake, looking up at the forested crater rim surrounding you on all sides, is a quietly powerful experience.
Stand-Up Paddleboarding (SUP), Also available. The flat water makes this an ideal SUP location, even for beginners.
Swimming, Swimming is possible in designated areas. The water is warmer than the cloud forest pools at Bajos del Toro, Río Cuarto sits at lower elevation in the transition zone, so temperatures are more comfortable.
Hiking, Trails around portions of the crater rim offer different viewpoints of the lake. Not extensive, but enough for a pleasant walk.
Fishing, Prohibited. The lake is a protected water source.
Practical Information
Getting There
Location: Río Cuarto district, Alajuela Province. Marked on Google Maps and Waze as "Laguna de Río Cuarto."
From Venecia: ~15 minutes
From La Fortuna: ~75 minutes
From San José: ~2.5 hours via Vara Blanca
From Bajos del Toro: ~45 minutes
Cost
You have to pay around $5 for parking, and $10 to rent a kayak for one hour. Bring cash.
Facilities
There are restrooms, a food stall, changing areas, and equipment rental.
What to Bring
• Swimsuit
• Sunscreen and hat (you're on open water with no shade)
• Water and snacks
• Camera (the aerial/elevated views are spectacular)
• Towel
• Cash for entrance and rentals
How It Fits Your Itinerary
Laguna de Río Cuarto works perfectly as a half-day activity combined with other regional attractions. Its location between Bajos del Toro and La Fortuna makes it a natural stop on a travel day or a side trip from either base.
From Venecia/Bajos del Toro base: Morning waterfalls in Bajos del Toro → afternoon kayaking at Laguna de Río Cuarto. Two completely different experiences (dramatic waterfalls → serene lake) in one day.
As a transit stop: Driving from Bajos del Toro to La Fortuna or vice versa, stop at Río Cuarto for 2 hours of kayaking. Breaks up the drive and adds a memorable experience.
From La Fortuna base: Day trip combining Laguna de Río Cuarto (morning) with Bajos del Toro waterfalls (afternoon), returning to La Fortuna by evening.
The Difference
Costa Rica is famous for dramatic experiences, waterfalls, volcanoes, wildlife. Laguna de Río Cuarto offers something subtler: the quiet perfection of a volcanic crater filled with water and forest. No drama, no adrenaline, no crowds. Just a beautiful lake that most visitors drive past without knowing it exists.
For travelers who appreciate calm natural beauty alongside the bigger attractions, it's an ideal complement to the waterfall-heavy itineraries of Bajos del Toro. A morning of swimming in turquoise pools under waterfalls, an afternoon kayaking across a green volcanic lake, that's a day that covers the full range of what this region offers.
Tips from a Local
Frequently Asked Questions
How do you get to Laguna de Río Cuarto?
The lake is in the Río Cuarto district of Alajuela Province and is marked on both Google Maps and Waze as "Laguna de Río Cuarto." It's about 15 minutes from Venecia, roughly 45 minutes from Bajos del Toro, around 75 minutes from La Fortuna, and about 2.5 hours from San José via Vara Blanca. Its position roughly halfway between Bajos del Toro and La Fortuna makes it an easy stop on a travel day.
Is Laguna de Río Cuarto free to visit?
There's no formal entrance charge described, but you pay for parking and rentals separately, so bring cash. Expect around $5 for parking and about $10 to rent a kayak for one hour. Kayak rental and parking are billed independently of each other.
How deep is Laguna de Río Cuarto and how did it form?
It's a volcanic crater lake, estimated to be more than 60 meters deep, and about 400 meters in diameter, so perfectly circular it looks drawn with a compass. It sits inside an ancient volcanic vent, which is why it has no river current, it's a closed crater. Part of the appeal is the strange beauty of floating above that deep, still volcanic water.
Can you swim in Laguna de Río Cuarto?
Yes, swimming is allowed in designated areas. Because Río Cuarto sits at lower elevation in the transition zone, the water is warmer and more comfortable than the cold cloud-forest pools at Bajos del Toro. Note that there's no shade on the open water, so bring sunscreen and a hat. Fishing, however, is prohibited because the lake is a protected water source.
What is there to do at Laguna de Río Cuarto?
Kayaking is the primary activity, single and double kayaks are available to rent, and the flat 400-meter-wide crater is easy to paddle across. Stand-up paddleboarding is also offered and works well even for beginners on the calm water. Beyond the water, there are trails around portions of the crater rim for a pleasant walk, and swimming in designated areas. Fishing is not permitted.
Are there facilities like restrooms and rentals at the lake?
Yes. Unlike the more rustic sites in the region, Laguna de Río Cuarto has restrooms, a food stall, changing areas, and equipment rental on site. You can rent single or double kayaks and stand-up paddleboards there. Even so, it's smart to bring your own water, snacks, and cash, since parking and rentals are paid separately.
How long should you spend at Laguna de Río Cuarto and when is the best time to go?
Plan on roughly 1 to 3 hours, it works well as a half-day activity or a 2-hour kayaking break on a drive between Bajos del Toro and La Fortuna. It's rated an easy visit and can be enjoyed year-round, though December to April (dry season) is best. Clear mornings are especially rewarding, when the calm surface reflects the surrounding trees like a mirror.
Good to Know
- Cell Service
- Limited and spotty near the lake.
- Payment
- Cash (colones) preferred at the private access points.
- Accessibility
- Limited. Reachable by a standard vehicle in the dry season; the narrow final gravel stretch favors a high-clearance or 4x4 vehicle from May to November. Minimal facilities.
- What to Bring
- Swimsuit, towel, sunscreen, water shoes
Continue Exploring
More guides and resources to help you plan your trip
Area GuideVenecia & Rio Cuarto: The Alternative Base for Costa Rica's Northern Interior
Where the cloud forest meets the lowlands, hot springs, canyoning, and zero tourists. The best base for exploring Bajos del Toro.
NatureLaguna de Hule: Costa Rica's Hidden Volcanic Crater Lake
Three ancient lakes inside a collapsed volcano, surrounded by untouched rainforest, visited by almost no tourists.
Hot SpringsRecreo Verde Hot Springs: Costa Rica's $10 Alternative to Tabacón
Natural mineral hot springs in the cloud forest, with canopy tours, hiking, and a spa, at a fraction of La Fortuna resort prices.