Abismo Guy Collet
The Abismo Guy Collet (SP-090) is the deepest cave in South America, and the deepest in the world that is formed in quartzite. Located in a tepui in northern Brazil near the border with Venezuela, this cave was first explored by cavers in 2006 to a depth of 671 meters.
New Athos Cave
The New Athos Cave (; ; ) also Novoafonskaya, Novy Afon Cave, or New Afon Cave is a karst cave in the Iverian Mountain in Abkhazia (Georgia) near New Athos. It is one of the largest caves in the world with the volume of its void of about 1,000,000 m³.