Mount Roraima (Portuguese: Monte Roraima [ˈmõtʃi ʁoˈɾajmɐ], Tepuy Roraima and Cerro Roraima;) is the highest of the Pakaraima chain of tepui plateaus in South America. :156 First described to Europeans by the English explorer Sir Walter Raleigh during his 1595 expedition, its 31-square-kilometre (12-square-mile) summit area :156 is bounded on all sides by cliffs rising 400 metres (1,300 ft). The mountain also serves as the tripoint of Venezuela, Guyana and Brazil. :156 Raleigh learned about it from indigenous peoples, who lived there before the European invasion of the 15-1600's.
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