Hot springs are scattered in the northern part of Wurung Crater. The distribution of hot springs follows the existence of existing faults. Several hot springs are manifested near Blawan Village. It consists of 19 sources whose temperature is between 30o - 50oC from nearly 100 springs whose temperature is below that. This hot spring produces water that is quite looking (TDS = 1-2g / kg) and close to neutral (pH = 6.4) with temperatures reaching 50oC. based on its SO2-Cl-HCO3 content, water is included in neutral water HCO3-SO4. The feature of the fault structure is marked by the Blawan Waterfall which causes the Kalipait River to cut the Ijen Tua Caldera Wall. The fault orientation that tends to the Northeast - Southwest causes a weak zone to access the Kalipait river flow out of the Ijen Tua Caldera Zone. Blawan Waterfall is also called Damarwulan Waterfall where there is a dam which was once the Damar Wulan bath. Visitors who come there usually wash their faces there, because the flow of water is still fresh and clean, and is believed to make you stay young.