Located in the Pacific Ocean, it lies to the east of the Sea of Japan, the East China Sea, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south.he four largest are Honshu, Hokkaido, Kyushu, and Shikoku, which make up about ninety-seven percent of Japan's land area. Japan's population of 126 million is the world's tenth largest. Approximately 9.1 million people live in Tokyo, the capital city of Japan, which is the second largest city proper in the OECD.