2. What caldera nearly wiped out the human race? Lake Toba in Sumatra, Indonesia is believed to be the largest resurgent caldera on earth. The caldera measures 100km long by 30km wide. This ...

Quilotoa is a water-filled crater lake and the most western volcano in Ecuador's Andes. The 3-kilometre-wide caldera was formed by the collapse of a volcano. Quilotoa is 111 miles (178km ...

The Phlegraean Fields is a caldera beneath a gigantic lake of liquid magma. They are more afraid of earthquakes than ...