Global Volcanism Program | Image GVP-11086
A narrow gap in the NNE rim of 7.5-km-wide Pleistocene Brouton caldera on Uratman volcano in the Kuril Islands has led to the formation of the bay. The caldera floor lies 250 m beneath the ocean surface, and the rim rises 450 m above that. The central Uratman cone grew to a height of about 680 m during the Holocene.
NASA International Space Station image ISS005-E-6514, 2002 (http://eol.jsc.nasa.gov/).
This image is made available as a Public Domain Work, but proper attribution is appreciated.