A mountainous tableland region of northern South America extending from southeast Venezuela into Guyana and northern Brazil.
and S.W.; and (3) the Guiana highlands.
When the Orinoco is reached its lower basin is contracted between the Guiana highlands and the northern sierras, and its tributaries begin to come in more nearly at right angles, showing that the margins of the actual valley are nearer and higher.
The rubber forests are on the Orinoco and its tributaries of the Guiana highlands.
through a granite spur of the Guiana highlands for a length of about.