Rubuta ci gaba don wannan sakin layi - Babban tafkin rami, wanda ake kira Lake Lake, yana cikin caldera a saman dutsen. An kafa caldera ta hanyar VEI 7 "Millennium" ko "Tianchi" fashewar 946, wanda ya fashe game da tephra. Wannan shi ne daya daga cikin manyan fashewa da tashin hankali a cikin shekaru 5,000 da suka gabata (tare da fashewar Minoan, fashewar Hatepe na Lake Taupo a kusan AD 180, fashewar 1257
na Dutsen Samalas kusa da Dutsen Rinjani da fashewar 1815 na Tambora).