I Indonesia has considerable geothermal potential based on geographical locationand geological condition that is located on a fault zone and in volcanic area. Thatencourages writer to understand characteristics of geochemistry geothermalenergy that works in research area. The location of research area is located inCipanas and surroundings, Cipanas District, Lebak Regency, Banten Province.Regionally research area consist of Diorite Quartz Formation, Dasite Formation,Clay Bojongmanik Formation, Limestone Bojongmanik Formation, and EndutVolcanic Rock. Locally research area is composed of Dasite Unit, Clay Unit,Andesite Unit, Limestone Unit, and Breccia Unit. Geothermal manifestations isvolcanogenic-high relief, it has of bicarbonate water, one source of reservoir,fluid condition is immature water, with geothermometer analysis and evaluationhaving temperature of the range 120-147°C, geoindicator outflow on west area ofresearch, upflow on Gunung Endut, isotope analysis is on meteoric line. Basedon the results of analysis, a relevant tentative model of geothermal area can beobtained.