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Mount Iwate consists of a younger eastern symmetrical stratovolcano (Higashi-Iwate, "East Iwate") overlapping an older western stratovolcano (Nishi-Iwate, "West Iwate") which has collapsed to form a caldera. The oval-shaped, 1.8 x 3 km caldera has a central cone containing a 0.5 km wide crater, partially filled by a crater lake.