Question: Henri van Gooven's most successful work was the novel Tropenwee, which was similar to a novella by Joseph Conrad, about a voyage up what river?
Sentence (from "Heart of Darkness"): Heart of Darkness (1899) is a novella by Polish-British novelist Joseph Conrad, about a voyage up the Congo River into the Congo Free State, in the heart of Africa, by the story's narrator Charles Marlow.
Relevant evidence: Yes