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Lava Is Also a Hazard

Mount Semeru spews lava as pictured from Sumber Wuluh village in Lumajang on December 6, 2021.
Mount Semeru spews lava as pictured from Sumber Wuluh village in Lumajang on December 6, 2021. Photo: Juni Kristwanto/AFP (Getty Images)

In addition to unleashing a massive plume of ash, Lelono said lava also cascaded down its slopes and traveled 2,600 feet (792 meters) into a nearby river. A dam burst near one village because of the lava flow, forcing hundreds of additional people to evacuate out of the path of the water.