East Asia
"East Asia or Eastern Asia is the eastern subregion of the Asian continent, which can be defined in geographical or cultural terms. ... The UN subregion of Eastern Asia and other common definitions of East Asia contain the entirety of the People's Republic of China, Japan, North Korea, South Korea, Mongolia and Taiwan. ... Culturally, China, Japan, Korea, Taiwan, and Vietnam are commonly seen as being encompassed by cultural East Asia." [East Asia. Wikipedia]