Mount Roraima, first described by the English explorer Sir Walter Raleigh in 1596, its 31 km2 (11.96 sq. miles) summit area is bounded on all sides by cliffs rising 400 metres (1,300 ft). The mountain serves as the triple border point of Venezuela (85% of its territory), Guyana (10%) and Brazil (5%).
This tabletop mountain is one of the oldest mountains on Earth, dating back two billion years when the land was lifted high above the ground by tectonic activity. The sides of the mountain are sheer vertical cliffs, with several waterfalls, making it nearly impossible to climb.