Some of the Sea of Okhotsk's islands are quite large. These include Japan's second largest island, Hokkaidō, as well as Russia's largest island, Sakhalin. Iony Island is the only island in open waters. It belongs to the Khabarovsk Krai of the Russian Federation. Most of the sea's islands are have no people making them ideal breeding grounds for seals, sea lions, seabirds, and other sea island fauna.