Indonesian traders, particularly from Sulawesi, who visited tropical Australia during the Indonesian monsoon season. They collected and processed sea-slugs (trepang, bêche-de-mer, sea cucumber), an important ingredient in their cooking. Archaeological evidence consists of stone structures used to support boiling vats, scatters of Indonesian potsherds, ash concentrations from smokehouses, graves, and living tamarind trees descended from seeds brought by the trepangers. Their cultural legacies to the Aborigines included metal tools, dugout canoes, vocabulary, art motifs, song cycles, rituals, and depictions of Macassan praus in rock paintings and stone arrangements. Macassan voyagers to Australia arrived around 1700 AD and continued till the end of the 19th century.