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Simushir, a longitudinal island lush green with foliage, separates the Pacific Ocean, right, from the Sea of Okhotsk. The waters connect at the top and bottom of the image, and is universally dark blue. The island includes multiple peaks, the second from the bottom is labelled the  Zavaritskogo caldera. The island is tilted diagonally from bottom left top right.

Nested Calderas of Zavaritskogo

Tucked away on a remote island in the Pacific, the volcano has recently been pinpointed as the likely source of a sunlight-dimming eruption.

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