Mount Batur is an active volcano located at the center of two concentric calderas north west of Mount Agung.
The south east side of the larger 10×13 km caldera contains a caldera lake.
The inner 7.5-kilometer-wide caldera, which was formed
during emplacement of the Bali ignimbrite,
has been dated at about 23,670 and 28,500 years ago.
Wow!!!!
It's older than Aunt Violet!
(I hope she won't read this line...)