Buraco das Araras

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.