Indonesia is possibly the most volcanically-active country in the world. It is the home of 127 potentially active volcanoes and one any given day it isn't surprising to see that 5-6 of them are erupting. Now, most of these eruptions are small puffs of ash or maybe the slow extrusion of lava at the summit. However, Indonesia is also home to some of the largest explosive eruptions in the historical record and beyond. Krakatoa in 1883, Tambora in 1815 and Toba around 73,800 years ago were massive blasts that left indelible mark on the region (and planet). The potential is there for local destruction and global impacts.