Sakhalin Oblast
Most of the people living in the oblast are ethnic Russians. However, there are also a few Koreans and other groups. Sakhalin Oblast has much natural gas and oil. So, it is Russia's fourth wealthiest federal subject and wealthiest oblast. Nearby is Khabarovsk Krai to the west and Kamchatka Krai to the north, and Hokkaido, Japan to the south.