Gruta Luminosa, Limestone cave in Iporanga, Brazil.
Gruta Luminosa is a limestone cave in Iporanga with an extensive network of chambers, underground rivers, and natural pools throughout its passages. The system displays a variety of rock formations distributed across multiple interconnected sections.
The cave is located within PETAR, a protected area established in 1958, and represents one of Brazil's most significant karst regions. Archaeological evidence found in deeper sections points to human presence dating back to prehistoric times.
The name refers to the natural light that filters through rock crevices, illuminating certain passages in an unexpected way. This quality shapes how visitors experience moving through the chambers.
Visits require protective gear including helmets and flashlights, and you must be accompanied by certified guides from the park staff. Weather conditions and water levels can affect conditions inside, so preparation is important.
The cave entrance towers about 705 feet (215 meters) high, making it one of the world's largest natural cave portals. This exceptional scale creates an overwhelming first impression upon arrival.
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