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Indonesia lies in volcanic arc area that is related to geothermal such as in Ungaran which is located 40 km southwest of Semarang, Central Java. Ungaran is formed by volcano tectonic depressions which form fault that shorten geothermal manifestations.There are several geothermal manifestations in Ungaran, such as fumarole, hot springs, hot pools, diluted bicarbonate waters, silica sinter teraces, and altered grounds. The manifestations which are related to rock permeability is dominated by fracture permeability like in Gedongsongo, Nglimut, and Kaliulo. Gedongsongo is the main geothermal manifestation. The Ungaran geothermal system is water dominated. Temperature manifestation on surface up to 91°C which can be interpreted that the reservoir has a high temperature system with minimum reservoir temperature of approximately 280oC. Its pH between 7-9, which is a good potential for geothermal energy utilization.The geothermal study of Ungaran can be used for understanding the geothermal potency. Therefore, it can be explored and exploited.