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?
Henri van Booven:  His most successful work was the novel Tropenwee (1904) ('Tropical agony'): a thinly veiled autobiographical literary report of a mission to Congo in 1898, somewhat similar to Heart of Darkness. 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.
Congo River