East Asia /iːst ˈeɪʒə/ noun1 •A geographic region comprising the eastern part of Asia, inclusive of China proper, Japan, North Korea, South Korea, and Taiwan and sometimes inclusive of Mongolia and Tibet and some or all of Southeast Asia and the Philippines.Yu Shan or Jade Mountain, 3997 meters, is the highest mountain in Taiwan and all of east Asia. It is built of metamorphic rock, as are all the mountains in Taiwan. — 1981