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Islands

Some of the Sea of Okhotsk's islands are quite large, including Japan's second-largest island, Hokkaido, as well as Russia's largest island, Sakhalin. Practically all of the sea's islands are either in coastal waters or belong to the various islands making up the Kuril Islands chain. These fall either under undisputed Japanese or Russian ownership or disputed ownership between Japan and Russia. Iony Island is the only island located in open waters and belongs to the Khabarovsk Krai of the Russian Federation.

The majority of the sea's islands are uninhabited, making them ideal breeding grounds for seals, sea lions, seabirds, and other sea island fauna. Large colonies of crested auklets use the Sea of Okhotsk as a nesting site.