Otak Kokok Gading Waterfall, situated in 709 meters amsl, is located in Montongbetok Village, Montonggading District, East Lombok Regency. Water outflow from cracks when lava meet sand, pyroclastic, and scoria tuff. Local people believe its water can cure illness. They also believe if water will turn white whenever an ill person is bathing in here. Around Otak Kokok there are 20 springs spread in the southern Rinjani Mt National Park in an area of 20 ha.