Editing Guiana Shield (section)

== Geomorphology ==
There are three upland areas of the Guiana Shield:
# 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.
# 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]].
# The [[Chiribiquete Plateau]] is a sandstone topped [[plateau]] with an elevation of {{convert|900|m|ft|0|abbr=on}} 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.

The north-central part of the Guiana Highlands is dominated by high flat-topped peaks called [[tepui]]s, of the Roraima supergroup and Quasi-Roraima formation, and the rounded granite peaks of the Parguaza and Imataca complexes to the north and southwestern edges of the area. The highest point in the shield is [[Pico da Neblina]] in Brazil at {{convert|2995|m|ft}}.<ref name="ibge2016">{{cite press release |url=http://saladeimprensa.ibge.gov.br/noticias?view=noticia&id=1&busca=1&idnoticia=3109 |title=Geociências: IBGE revê as altitudes de site Pontos culminates |language=pt |trans-title=Geosciences: IBGE revises the altitude of seven high points | location=Brasília |publisher=[[Brazilian Institute of Geography and Statistics]] (IBGE) |date=2016-02-29 |access-date=2016-03-02 }}</ref> Pico da Neblina is the highest summit of the larger [[Neblina massif]], a highly eroded sandstone plateau that straddles the Venezuela-Brazil border and that has lost the typical tabletop shape of the other tepuis in the region.{{citation needed|date=August 2015}}