Gunung Agung on Bali may be ramping up to an eruption. If so, this could be more than interesting on the densely-populated island. Agung’s 1963 eruption was VEI5, i.e., at least as large as Mt. St. Helen’s in 1980. It has some noteworthy neighbors nearby on the Sunda arc. Rinjani is visible from Agung’s summit when the weather is clear. Tambora is a bit further east.
Meanwhile, there is a state of emergency on Ambae in Vanuatu.