This question is based on Literary Principles G... - JAMB Literature 1992 Question

This question is based on Literary Principles.
Going up the river was like traveling back to the earliest beginnings of the world when vegetation rioted on the earth and the big trees were kings An empty stream, a great silence, an impenetrable forest. The air was warm, thick, heavy, sluggish. '
Heart of Darkness by Joseph Conrad.
The landscape described in the passage above is