Figure 14.32

Sunda Arc volcanoes. Krakatau and Tambora are two of Indonesia’s approximately 150 active volcanoes (red triangles). Toba is considered extinct because it has not erupted in over 10,000 years. The caldera of Tambora (inset photo), which was formed in 1815, is 7 km (4.5 mi) across and approximately 1,240 m (3,970 ft) deep.