Japan is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north toward the East China Sea, Philippine Sea, and Taiwan in the south. Japan is the eleventh most populous country in the world, as well as one of the most densely populated and urbanized. About three-fourths of the country's terrain is mountainous, concentrating its population of 123.2 million on narrow coastal plains. Japan is divided into 47 administrative prefectures and eight traditional regions. The Greater Tokyo Area is the most populous metropolitan area in the world, with more than 35.6 million residents.
Japanese culture was influenced from ancient times to the Middle Ages primarily by multiple Chinese dynasties, with substantial derivation from the Tang Dynasty and to a lesser extent by other Asian countries. Japanese people are from three distinct ancestral groups: Jomon, Yayoi and Kofun, with 13%, 16% and 71% of genetic ancestry, respectively. During the Kofun period, it is said that migrant groups from China came to Japan and settled on the island, bringing with them various cultural advances and centralized leadership. Today, the culture of Japan stands as one of the most influential cultures around the world, mainly because of the global reach of its popular culture.