After several stops in Madeira, the Canary islands, and Cape Verde and then rounding the Cape of Good Hope, towards the middle of the trip Bory suddenly left the ship of Captain Baudin with whom he was in conflict and explored alone (and with limited resources) several islands of the African seas. He visited Mauritius in March 1800 during a stopover. From there, he sailed to the neighboring island of Réunion, where in October 1801 he ascended the Piton de la Fournaise, the active volcano of the island, and wrote the first general scientific description of it. He gave the name of his former professor Dolomieu, of whose death he had just learned, to one of the craters he described as a mamelon. He gave his own name to the summit crater, the . On the way back, he continued his geographical, physical and botanical explorations on the island of Saint Helena