Gruta da Torrinha, Underground cave system in Chapada Diamantina, Brazil.

Gruta da Torrinha is an underground cave system in Chapada Diamantina that stretches for several kilometers beneath the surface. The cave features natural mineral formations including aragonite crystals, gypsum deposits, and calcite structures that line the walls and ceiling.

French speleologists conducted the first scientific exploration and mapping of this cave system in the early 1990s, bringing it to wider attention. These initial expeditions established the foundation for current understanding and ongoing exploration of this underground complex.

The cave lies in the village of Torrinha, 15 km from Iraquara, and tourism has become the main source of income for the local people and their neighbours. Three routes are open to visitors, one of which can be covered in about three hours.

The cave can be explored through different routes with varying difficulty levels depending on which sections you visit. Visitors should wear sturdy footwear and be prepared for uneven ground and tight passages.

The cave holds the second-largest aragonite flower in the world, a mineral formation the sources single out among its rarities. Visitors also pass helictites and gypsum needles that look like glass, formations rarely found together in one cave.