Gruta do Lago Azul
Duration1 hr, 30 mins
The Blue Lake Cave is Bonito/MS's main postcard attraction, as well as one of the largest flooded cavities on the planet. What appears to be a simple underground lake is actually a limestone rock system that took millions of years to form — and the lake occupies the deepest point of a cave with more than 150 meters of height between the entrance and the water surface.
The visit is contemplative: we accompany the descent of 300 steps carved into the rock, the guided route and the approximately 10 minutes on the observation deck. It is not an adventure activity — it is a geological testimony.
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The route begins with a 200-meter trail on a path carved into the rock to the cave entrance. From there, the 300-step staircase descends 150 meters in height — equivalent to a 50-story building — down to the lake level. During the descent, the guide makes stops for rest and photos, and the pace is the visitor's.
Along the walls, speleothems of different shapes and sizes record thousands of years of mineral formation. The cave is home to stalactites and stalagmites that cannot be touched — contact with hands interrupts the formation process and damages structures that took millennia to grow. These formations are protected by conservation rules that apply to all visitors.
During exploratory dives carried out in the cave, researchers found fossils of extinct megafauna animals: Giant Ground Sloth, Saber-toothed Tiger and Mastodons.
These remains were preserved at the bottom of the lake for thousands of years, turning the cavity into a true underground natural history museum. The discovery reinforces the geological importance of the attraction, which goes far beyond the color of the lake.
📍 21 km from downtown Bonito · ⏱ 1h30 · Difficulty: moderate
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The visit follows a linear route with well-defined stages, all accompanied by a certified guide.
The path to the cave entrance is a 200-meter trail on flooring carved into the rock, not on dirt. The terrain is flat and the walk takes only a few minutes. The route is the same on the return, so you already know the path when you go down.
The staircase is steep and has a handrail along the entire route. The guide accompanies the group and makes scheduled stops for rest. Wearing sneakers and a face mask is mandatory throughout the route — it is not possible to enter wearing flip-flops, sandals or without facial protection.
Upon reaching the bottom, the group remains approximately 10 minutes on the observation deck over the lake. It is enough time to take photos and absorb the turquoise-blue color of the water. The stay is controlled to maintain the flow of visitors — it is not possible to extend the time on the deck.
The climb requires more stamina than the descent. The same route of 300 steps in the opposite direction tests endurance, especially on warmer days. Anyone with breathing difficulties or reduced mobility should assess in advance whether the return is feasible. The pace is free and stops are allowed.
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Mandatory voucher: show the PDF of the tickets on your phone at the entrance
Tour requirements: minimum age of 6 years and minimum height of 1.30 m
Transportation: not included — must be booked separately
Infrastructure: accessible restroom, free parking, changing room and rest area
Fitness level: moderate — the climb of 300 steps requires stamina
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The Blue Lake Cave is suited for those who want to witness a rare-scale geological formation and capture images of the underground lake. There is no adrenaline, rappelling or swimming — the tour is entirely contemplative.
If the priority is adrenaline, this is not the right tour — those looking for rappelling or cave swimming will find better options in Bonito. To take the tour, it is necessary to be at least 6 years old and 1.30 m tall, and the staircase requires cooperation and constant attention.
The visit is in single file with a guide — there is no free exploration of the cave
Time on the lake deck is approximately 10 minutes
The climb back is more demanding than the descent — plan for stops
Transportation to the attraction is not included and must be booked separately with Bonitour
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"Every step down and back up is worth it... it is a wonderful contemplation."
— Daiane G. Magnaguagno
"The descent is easy, with steps and handrails, and can be done without great difficulty; the climb back requires a little more stamina, but you just go at your own pace and take short breaks."
— Marilza Peixoto Leite
"For the price, it is definitely worth it. Also because it is one of Bonito's postcard attractions!"
— Samuel Matsuura
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Yes, the tour requires a minimum age of 6 years and a minimum height of 1.30 m. We recommend talking to a consultant to assess whether the 300-step route fits the family's routine.
No, transportation to the attractions in Bonito is always booked separately. Bonitour offers shared transfer, private transfer and taxi — consult a specialist to choose the best option.
No. Lunch is not included and can be purchased separately.
The attraction's structure has wheelchair accessibility and an accessible restroom, but the 300-step descent to the lake is not wheelchair accessible. We recommend confirming the details of the route with a consultant.
Yes, wearing a face mask is mandatory throughout the route inside the cave. The cave is home to bat colonies, and the mask is necessary to prevent inhalation of fungal spores and bacteria present in the air.
To enter the attraction, it is necessary to present the PDF with the tickets. Our team sends the document in advance via WhatsApp.
📌 Blue Lake Cave Voucher: it is mandatory to present the PDF on your phone.
⚠️ To take this contemplative tour, wearing a face mask and sneakers is mandatory during the activity
Tour inside the cave, with an initial 200 m trail to the entrance of the cavity; descending into the cave, there is a steep staircase of approximately 300 steps, equivalent to about 150 m in height, down to the blue-water lake at the bottom.
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