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have formed on the flanks of the volcano. They include Mount Tulik on the caldera's southeastern slope, Mount Idak to the northeast, and Jag Peak. A crater lake once filled much of the caldera to a depth of over , but the lake ultimately drained through a notch eroded in the northeast rim. The prehistoric lake attained a maximum depth of about 150 m and the upper surface reached an elevation of about 475 m, at which point it overtopped the low point of the caldera rim. Small, shallow remnants of

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