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.
Siebenhengste-Hohgant-Höhle
In 2010, it was the world's 11th longest cave, with a 154-km development. It is also the world's 22nd deepest cave at 1,340 m deep.