Sinkholes of South America

Gruta do Centenário (English: Centenary grotto) (MG-1081), is a cave located in the municipality of Mariana, in the state of Minas Gerais, Brazil. It is the largest and deepest quartzite cave in the world, and second in the country in terms of unevenness. Other caves which are part of the same system have now been partially explored.

Lapa Terra Ronca or Caverna Terra Ronca I (GO-063), is a dolomitic limestone cave inside the area of the Terra Ronca State Park, which houses the largest collection of caves and grottoes in the midwest with a number of about 200 being that only Terra Ronca and Angelica are open for the tourists. It is located about 400 kilometers from Brasília, midway between the municipalities of São Domingos, Posse e Guarani de Goiás, in the State of Goiás, Brazil.

Sima Martel (Sima Menor) is an enormous sinkhole located on the summit of plateau of Sarisariñama tepui, in Bolívar State, Venezuela. It is unusual due to several factors including its enormous size and depth, location on the top of the only forested tepui and having a patch of forest on its base. It is named after the speleologist Édouard-Alfred Martel.

Sima Humboldt (Sima Mayor) is an enormous sinkhole located on the summit of the plateau of Sarisariñama tepui in Bolívar State, Venezuela. It is unusual for several reasons, including its enormous size and depth, its location on the top of the only forested tepui, having a patch of forest on its base and also due to the weathering process that formed this sinkhole. The feature is named after scientist and explorer Alexander von Humboldt.

Buraco das Araras - Dolina dos Maracanas (BR-020) (English: Hole of the Macaws) is one of the largest quartzitic caves located in the State of Goiás, Brazil. It is located about 120 kilometres (75 mi) west of Brasília and 16 kilometres (9.9 mi) from the district of Bezerra, in the municipality of Formosa. It is considered one of the largest sinkholes (dolinas) in the world.