There is a painting , near the East Alligator River crossing , which shows a man with a gun and long pigtails down his back . This would be one of the Chinese workers brought to Darwin in the late 19th century . Near the East Alligator River crossing , a figure was painted of a man carrying a gun and wearing his hair in long pigtails down his back ; the latter identified him historically as a Chinese labourer brought to Darwin in the late 19th century .