A lake of blue waters that impresses for its incredible depth and transparency, the Mysterious Lagoon is located at the bottom of a sinkhole 75 meters in depth, a type of geological feature of karst areas that is similar to a hole, which is entirely covered and surrounded by forests. 

From 6 feet deep, the Mysterious Lagoon is considered a phreatic cave, a cavity formed by the flow of water from the groundwater table, it is one of the deepests flooded caves in Brazil, reaching more than 220 feet deep, record made by Gilberto Menezes de Oliveira in 1998. 

Because of the various flooded cavities that exist in the region, such as the Mysterious Lagoon, Anhumas Abyss, Mimoso Grotto, among others, the Bodoquena Mountain Range is considered a landmark in Brazil for the practice of cave diving and one of the best places for the development of this activity. 

The Mysterious Lagoon was closed to tourist visitation since 2005, due to the lack of its Speleological Management Plan, a document that includes the environmental assessment of the area and establishes guidelines for its management and conservation. 

That same year, the area was acquired by the same family responsible for the tourist attractions Rio da Prata and Estância Mimosa, which initiated the environmental studies required for the Management Plan, and which will operate the visitation at the Mysterious Lagoon , following the same guidelines for quality and sustainability that led these tourist attractions to earn several national awards. 

The Management Plan of the Mysterious Lagoon was completed in 2009, by a multidisciplinary team of 15 researchers and submitted to the National Center for Research and Conservation of Cave - CECAV / ICMBIO who delivered to the state environmental organ (IMASUL/MS) in 2010 a technical opinion approving the Management Plan, with recommendations for the licensing of the cavity. 

Thus, in 2011, after 6 years closed to tourist visitation, the Mysterious Lagoon finally is back into operation, offering the acitivities: Trail and Snorkeling, Scuba Diving and Technical Diving (Cave Diving).