The most northerly point, the Serra Roraima on the Venezuela and British Guiana frontier (5° 10' N.), is 56 m.
Roraima and follows the water-parting east and south to the source of the Ireng or Mahu river, which with the Takutu forms the boundary as far south as 1° N.
Some of the culminating points in these ranges are the Cerros Yaparana (7175 ft.) and Duida (8120 ft.) in the Parima sierras near the upper Orinoco, the Sierra de Maraguaca (8228 ft.), and the celebrated flat-topped Mt Roraima (8530 ft.) in the Pacaraima sierras on the boundary line with Brazil and British Guiana.
Cephalotus occurs only near Albany in Western Australia, Heliamphora on the Roraima Mountains in Venezuela, Darlingtonia on the Sierra Nevada of California, and these three genera too are as yet monotypic; of Sarracenia, however, there are seven known species scattered over the eastern states of North America.
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