The bund of the caldera is between 1,267 - 2,152 meters high. Inside the first caldera, shaped a second caldera circled with the diameter about 7 kilometers.

Mount Batur has been so many times erupted. Since 1804, this mountain has been erupted 26 times. The most powerful of a large explasion was in 2 August - 21 September 1926. The explosion of the mountain piled Batur village and Ulun Danu Temple, near Bedugul. The last explasion was in 2000.

The trekking to mount Batur is guaranteed exciting. When you reach the top of the mountain, when sunrise, the panorama is the best view in the world. On that time, you will see the beauty of Bali island, sun bathed with the sun. Beside the rug of Batur Lake, at the same point, you will also see the Mount Agung, the highest mountain in Bali. Furthermore, you can see also Mount Rinjani in Lombok island. For your information, via road, you must reach Padangbai Harbour in order to reach Lombok island.

The starting point of trekking to Batur mountain usually in front of Pura Jati, Toya Bungkah Kintamani. Usually, the first step can be done early in the morning around 4am. With normal step, the journey to the top can be reached around 2 hours.