When the volcano erupted in 1815, it climaxed on 10 April. It was the most destructive volcanic eruption in modern history. It has been estimated that it was four times larger than the 1883 eruption of Krakatoa, between Java and Sumatra, in terms of volume of magma ejected. Before the explosion, Tambora was 4,300 m (14,100 ft) high, now it is only 2,722 m (8,930 ft) high. Its massive crater is therefore a caldera.