At the extreme end of East Java, the Banyuwangi region offers wonderful possibilities for swimming and attracts many surfers. But more importantly, it is the departure point for visits to Kawah Ijen (“green crater”), one of Indonesia’s most active volcanoes. It reaches close to 2,400 metres at its highest point. In its crater lies a highly acidic lake with green water, offering stunning light shows at day break. The sulphur found at the summit is exploited by Indonesian workers, who leave the crater carrying heavy loads on their backs. The volcano is also famous for the blue flames that emanate from its vents. This beautiful phenomenon, created by the combustion of sulphuric gases in contact with air, can only be observed at night.