Volcanic crater lake
…metres (1,657 ft) deep at its deepest point, Lake Toba is the largest crater lake in the world. The highest volcano in the world, 6,893-m (22,615-ft) Ojos del Salado in Chile, has a permanent crater lake about 100 m (330 ft) in diameter at an elevation of 6,390 m (20,965 ft) on its eastern side. Around Mount Gambier…