The Kamchatka Peninsula forms the majority of the krai's territory, separating the Sea of Okhotsk and the Bering Sea in the Pacific Ocean. The remainder is formed by a minor northern mainland portion, Karaginsky Island and the Commander Islands in the Bering Sea. It is bordered by Magadan Oblast to the west and Chukotka to the north. Kamchatka Krai is an active volcanic zone which is home to Kluchevskaya, the largest volcano in Eurasia, and the Decade Volcanoes of Avachinsky and Koryaksky.