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Wai Sano volcanoWai Sano is a 3.5x2.5 km wide caldera at the western end of Flores Island. It contains a crater lake 260 m below the highest peak of the rim, Mt Umpu Rua peak, and the SE caldera wall is truncated by the slopes of 1632-m-high Gunung Cerak.
Although no historic activity is known from Wai Sano, it is believed to have erupted in the past 10,000 years. Two mildy active fumarole areas are located on SE shore of the lake.