Mount Roraima (Spanish: Monte Roraima [ˈmonte roˈɾaima], also known as Tepuy Roraima and Cerro Roraima; Portuguese: Monte Roraima [ˈmõtʃi ʁoˈɾɐ̃jmɐ]) is the highest of the Pakaraima chain of tepui plateau in South America. First described by the English explorer Sir Walter Raleigh in 1596, its 31 km2 summit area is defended on all sides by tall cliffs rising 400 metres (1,300 ft). The mountain includes the triple border point of Venezuela, Brazil and Guyana.
Mount Roraima lies on the Guiana Shield in the southeastern corner of Venezuela's 30,000 square kilometres (12,000 sq mi) Canaima National Park forming the highest peak of Guyana's Highland Range. The tabletop mountains of the park are considered some of the oldest geological formations on Earth, dating back to some two billion years ago in the Precambrian.
The highest point in Guyana and the highest point of the Brazilian state of Roraima lie on the plateau, but Venezuela and Brazil have higher mountains elsewhere. The triple border point is at 5°12′08″N 60°44′07″W, but the mountain's highest point is Maverick Rock, 2,810 metres (9,219 ft), at the south end of the plateau and wholly within Venezuela.