"Nantai stratovolcano rises above the north shore of Lake Chuzenji in Nikko National Park, and forms a backdrop to the renowned temple complex at Nikko. Lava flows from the early stage of the construction of Nantai volcano dammed up the Daiyo River, forming Lake Chuzenji. The dramatic Kegon waterfall plunges over this barrier. Nantai has an asymmetrical profile when viewed from the west as a result of late-stage collapse of the north side of the volcano. Two major late-stage eruptions ejected large amounts of scoriae, followed by the emission of pyroclastic flows. The latest effusive activity of Nantai produced the Osawa lava flow, a thick, viscous dacitic flow that traveled from the breached crater down the north flank. The Bentengawara pyroclastic-flow deposit representing the latest known eruptive activity was radiocarbon dated at about 10,000 years Before Present and was emplacement following a quiescent period of about 3000 years."  -Smithsonian Volcano Archive
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