Batur volcano on Bali island
The volcano is located at the center of two concentric calderas NW of Agung volcano. The outer 10 x 13.5 km wide caldera was formed during eruption of the Bali (or Ubud) Ignimbrite about 29,300 years ago and now contains a caldera lake on its SE side, opposite the satellitic cone of 2152-m-high Gunung Abang, the topographic high of the Batur complex. The last big erruption was 2000.
Actually the mount Batu isn't a volcano, its a dome in a big crater of a volcano located near a beautiful and idyllic lake the Batur lake. Its worth to spend a day or more on the lake side and climb the volcano in about three hours. But be adviced that it could be very cold on the top and its hard to climb due the walk over the sharp lava stones.