Above is a picture of Tambora, in Indonesia taken from the space shuttle.  It's 1815 eruption is the largest volcanic eruption in recorded history.  Causing massive loss of life (92,000), it caused the year without a summer, in which global temperatures fell dramatically.  While only 10,000 people died as a direct result of the eruption, an estimated 82,000 died from starvation.  In all about 150 km³ were erupted from the volcano.  To put this in perspective, Mt. St. Helens only produced 1 km³.  It is estimated the Tambora was 13,000 feet high before the 1815 eruption, now it is greatly reduced.