| Bratan Caldera | |
|---|---|
 Pura Ulun | |
| Highest point | |
| Elevation | 2,276 m (7,467 ft) |
| Coordinates | 8°17′S 115°08′E / 8.28°S 115.13°E |
| Dimensions | |
| Area | 66 km2 (25 mi2) |
| Geography | |
 | |
| Location | Bali, Indonesia |
| Geology | |
| Rock age | Holocene |
| caldera | |
| Rock type(s) | Basalt, Basaltic andesite, Andesite |
| Volcanic arc | Sunda Arc |
| Last eruption | less than 23 ka |
Bratan or Catur or Tjatur is a dormant caldera/stratovolcano located at the northern side of Bali island in Indonesia. The volcanic complex covers an area of 11 by 6 kilometres (6.8 mi × 3.7 mi). The caldera contains 3 separate lakes (Tamblingan, Buyan, and Bratan) and 5 post-caldera volcanoes (Lesung, Tapak, Sengayang, Pohen, and Adeng).
Volcanism at Bratan is the result of subduction as the Indo-Australian plate subducts under the Eurasian plate. Although there have been no eruptions in historic times, geothermal activity in the form of numerous hot springs and fumaroles heated by a magma chamber at depth.
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