Sabancaya rises above the valleys of the Colca river and of some tributaries of the Siguas river with about 35,000 people living in them. Sabancaya is particularly dangerous for the Colca river valley, a major tourism destination in Peru with the towns Achoma, Cabanaconde, Chivay, Ichupampa, Lari, Maca, Madrigal, Pinchollo, Yanque and others. About 30,000 people live within from the volcano. The flanks of Sabancaya themselves include roads and a major power line that comes from the Mantaro Power Plant and delivers electricity to southern Peru; all of these could be threatened in an eruption. In the case of a major Plinian eruption, at least 60,000 to 70,000 people would be threatened. Rock fall would affect the area close to the summit domes, as would pyroclastic flows; these would be a further hazard to the valleys draining the volcano.