Gedongsongo surface manifestations of the Ungaran geothermal prospect in Central Java, Indonesia, have high temperature properties, 72 - 870C, 2 – 6 pH and 770 ppm of chloride. The stable isotopic ratios of ä18O and äD of two adjacent manifestations show a slightly different enrichment. The western part reveals a more magmatic water influence than those of the eastern one. This is supported by the presence of relic manifestations as most occurs in the eastern part; whereas active fumaroles and steaming ground exist at western part.

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