Global Volcanism Program | Image GVP-00811
The arcuate islands of Banda Neira and Lonthor, seen here looking E from the summit of Indonesia's Banda Api volcano, are remnants of two largely-submarine calderas that preceded the construction of the Banda Api stratovolcano. The outer caldera has a diameter of 7 km and the nested inner caldera is 3 km wide. Neira, the largest town in the Banda Islands, occupies the southern tip of Banda Neira Island.
Photo courtesy Tom Casadevall, 1988 (U.S. Geological Survey).