Departure for the way back to Makassar (4h30 journey), crossing beautiful landscapes and visiting en route the idyllic site of the Bantimurung waterfall, a protected nature reserve, famous for its magnificent multicolored butterflies. Arrival in Makassar. Lunch at a local restaurant before transfer to the airport. Take-off for Manado on a regular flight with Garuda (GA 682 – UPG/MDC – 5:15-7:00 p.m.). Flight to Manado in North Sulawesi. Arrival and welcome then transfer to Tomohon, the city of volcanoes, installation in a lodge surrounded by 3 active volcanoes... First explanation of subduction volcanism and the geological particularities of the Moluccas plates and the island arcs of the Sangihe and halmahera. Hotel night.