High Quality Content by WIKIPEDIA articles! Mount Roraima (Spanish: Monte Roraima , also known as Tepuy Roraima and Cerro Roraima; Portuguese: Monte Roraima ) is the highest of the Pakaraima chain of tepui plateau in South America.:156 First described by the English explorer Sir Walter Raleigh in 1596, its 31 km2 summit area:156 is defended by 400-metre-tall cliffs on all sides. The mountain includes the triple border point of Venezuela, Brazil and Guyana.:156