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Guiana Highlands

plateau and low-mountain region of South America located north of the Amazon and south of the Orinoco River. Comprising a heavily forested plateau, they cover the southern half of Venezuela, all of the Guianas except for the low Atlantic coastal plain, the northern part of Brazil, and a portion of southeastern Colombia. They are geologically similar to the Brazilian Highlands, from which they are separated by the eastern part of the Amazon lowland. The terrain comprises a mixture of three ascending elements: a basement of rolling hilly upland, standing mostly less than 1,000 feet (300 metres) above sea level; low mountains, near stream divides, ranging from 2,000 to 3,000 feet (600 to 900 metres) above sea level; and tabular plateaus, capped with resistant sandstone. The highest elevations are formed by the tabular plateaus, such as Mount Roraima (9,094 feet [2,772 metres]), where the boundaries of Brazil, Venezuela, and Guyana meet. The Guiana Highlands extend westward across the Upper Orinoco

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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