Mount Batur (Gunung Batur) is an active volcano located at the center of two concentric calderas north west of Mount Agung on the island of Bali, Indonesia. 

The south east side of the larger 10×13 km caldera contains a caldera lake. Both the larger caldera, and a smaller 7.5 km caldera were formed by a collapse of the magma chamber, the first larger collapse taking place about 29,300 years ago, and the second inner caldera collapsing about 20,150 years ago.

On 20 September 2012 UNESCO made Mount Batur Caldera a part of the Global Geoparks Network.

Heavy sedimentation in Mount Batur Caldera decreases the water in the lake. A plan was devised to restrict locations around the lake for tourist accommodations, to inform residents of the problems of fish farm cages in the lake, and perhaps to dredge some of the natural sedimentation from volcanic ash.

- Wikipedia