 Nitmiluk Gorge is made up of thirteen gorges, with rapids and falls, and follow the Katherine River, which begins in Kakadu.During the Dry, roughly from April to October, the Nitmiluk Gorge waters are placid in most spots and ideal for swimming and canoeing.There may be freshwater crocodiles in most parts of the river, as they nest along the banks, but they are harmless to humans.