Almost all of the state is occupied by the Guiana massif; this suffered epirogenic movements that reactivated the basal rock of the shield, cut by fluvial erosion, reached it and gave rise to a staggering of jumps, originating tabular reliefs known as tepuis.

The Tepuis are located mainly in the center and south of the structure.
The average altitude is 400 m, with a generalized south-north slope.
The highest plateaus exceed 2,000 m. The highest point is Mount Roraima (2,875 m), located in the Pacaraima Range, which continues south with those of Parima and Tapirapeco.
The north of the massif is quite homogeneous, with heights below 400 m and numerous witness hills.
In the northeast, the Nuria and Imataca mountains stand out, as well as plateaus and hills over 500 m high drained by the Yuruari River.
The southeast sector is separated from the northwest sector by the Erebato River and the upper Ventuari Valley.
It comprises the Great Savannah and the rest of the territory west of the Caroni River, made up of three high plateaus.
The southwest of the massif is made up of lowlands through which the Ventuari, Alto Río Negro and Alto Orinoco rivers flow, with flat topography interrupted by witness hills.
Almost all of the state is occupied by the Guiana massif; this suffered epirogenic movements that reactivated the basal rock of the shield, cut by fluvial erosion, reached it and gave rise to a staggering of jumps, originating tabular reliefs known as tepuis.
The Tepuis are located mainly in the center and south of the structure. The average altitude is 400 m, with a generalized south-north slope. The highest plateaus exceed 2,000 m. The highest point is Mount Roraima (2,875 m), located in the Pacaraima Range, which continues south with those of Parima and Tapirapeco. The north of the massif is quite homogeneous, with heights below 400 m and numerous witness hills. In the northeast, the Nuria and Imataca mountains stand out, as well as plateaus and hills over 500 m high drained by the Yuruari River. The southeast sector is separated from the northwest sector by the Erebato River and the upper Ventuari Valley. It comprises the Great Savannah and the rest of the territory west of the Caroni River, made up of three high plateaus. The southwest of the massif is made up of lowlands through which the Ventuari, Alto Río Negro and Alto Orinoco rivers flow, with flat topography interrupted by witness hills.
Bolívar (state)