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Poco Leok
"Poco Leok volcano in western Flores Island was constructed with an irregular 7-km-wide caldera of uncertain origin. No pyroclastic-flow deposits are associated with the "caldera," which is poorly known geologically (Casadevall, 1989, pers. comm.). Poco Leok volcano was constructed within the caldera, culminating in the eruption of an andesite lava within the crater area. Volcanism is of Quaternary age (van Bemmelen, 1949b), and four fumarole fields are located at elevations of 825-1200 m within the depression. The Ulumbu geothermal field is located on the flank of Poco Leok at 650 m elevation and includes hot springs, fumaroles, mud pots, and steaming ground."  -Smithsonian Volcano Archive
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