<P> There are three upland areas of the Guiana Shield: </P> <Ol> <Li> The Guiana Highlands proper are in Venezuela east of the Orinoco and extend across much of west - central Guyana and into the northern Roraima state in Brazil . </Li> <Li> The Tumucumaque Uplands which are a series of central massifs in an arc from the Wilhelmina Mountains of south - central Suriname, along the southern boundary of Suriname and Guyana, forming the Acarai Mountains of Roraima state and the Tumuc - Humac Mountains of Pará and Amapá states of Brazil . From this arc, the southern uplands slope gently downwards towards the Amazon River and the northern uplands slope gently downwards toward the Atlantic . </Li> <Li> The Chiribiquete Plateau is a sandstone topped plateau with an elevation of 900 m (2,953 ft) that forms the western edge of the shield . The plateau is separated from the eastern Andes by the thick Neogene sediments of the Sub-Andean Trough that runs along the northern and western rim of the Guiana Shield . </Li> </Ol> <Li> The Guiana Highlands proper are in Venezuela east of the Orinoco and extend across much of west - central Guyana and into the northern Roraima state in Brazil . </Li> <Li> The Tumucumaque Uplands which are a series of central massifs in an arc from the Wilhelmina Mountains of south - central Suriname, along the southern boundary of Suriname and Guyana, forming the Acarai Mountains of Roraima state and the Tumuc - Humac Mountains of Pará and Amapá states of Brazil . From this arc, the southern uplands slope gently downwards towards the Amazon River and the northern uplands slope gently downwards toward the Atlantic . </Li>

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