Gruta do Mimoso, Bonito MS: the cave where you get into the water

The Gruta do Mimoso is the Bonito cave where visitors can actually enter the water. It has a clear underground lake, installed lighting and options ranging from a walking visit to scuba diving — the opposite of the Blue Lake Cave, where the water is only to be looked at.

What the Gruta do Mimoso is

The Gruta do Mimoso lies on a rural property in the Bonito region and is a limestone cave with a clear lake inside. The descent is by stairway to the chamber, and there visitors find what no other cave open to tourism in the area offers: the possibility of getting into the water.

The obvious comparison is with the Gruta do Lago Azul, and it helps you choose. At the Lago Azul the lake is viewed from a platform and the spectacle depends on natural light entering the mouth. At the Mimoso the lighting is installed, the water is accessible, and the experience is of being inside the cave rather than looking at it.

Walking visit, snorkelling and diving

• Walking visit: descend to the chamber, follow a guided route and look at the lake without entering.
• Snorkelling: enter the water with a buoyancy vest, mask and snorkel to see the submerged formations from above.
• Scuba diving: restricted to certified divers, with a briefing specific to confined environments.

The option you choose sets the length of the visit and the equipment. Decide before booking, because switching on the day is rarely possible.

What it is like to be in water inside a cave

The first thing that changes is your frame of reference. With no daylight and no horizon, the sense of depth and distance goes: formations that look close are metres away, and the bottom of the lake looks far shallower than it is, because clear water removes the usual visual cues.

The second is sound. An enclosed chamber returns every breath through the snorkel, and the silence between breaths is more complete than in any river. That combination — no reference and no noise — is what makes this different from an ordinary float, even with identical equipment.

What the access is like

The descent is by stairway, in an enclosed, humid passage with a handrail. It is not as long as the one at the Lago Azul, but it asks the same things: closed shoes with grip and free hands. Anyone with mobility limitations should speak to the operator before booking.

When to go

Being underground and artificially lit, the cave does not depend on sun or on time of day — unlike the Lago Azul. Heavy rain can affect access to the property and, in extreme cases, the operation. It is therefore a good card for overcast days, when river floats lose their appeal.

Frequently asked questions

Is it worth doing both caves?

Yes, because they are different experiences: one is contemplation by natural light, the other immersion under installed light. If you can only do one, choose by whether you want to get into the water.

Can someone claustrophobic manage?

The chamber is wide, but the descent passage is enclosed. Anyone with that condition should tell the operator and consider the walking visit rather than the snorkel.

Written by: Adriano Habermann Last updated: September 13, 2026