South East Asia:
Southeast Asia or Southeastern Asia is a subregion of Asia, consisting of the countries that are geographically south of China, east of India and north of Australia. The region lies on the intersection of geological plates, with heavy seismic and volcanic activity.
Southeast Asia consists of two geographic regions: the Asian mainland, and island arcs and archipelagoes to the east and southeast. The mainland section consists of Burma (Myanmar), Cambodia, Laos, Thailand, Vietnam and Malaysia (or to be more precise, Peninsular Malaysia). The maritime section consists of Brunei, East Timor, Indonesia, Malaysia, the Philippines, and Singapore. Some definitions include Taiwan at the north. Austronesian peoples predominate in this region. The major religions are Buddhism and Islam, followed by Christianity. However a wide variety of religions are found throughout the region, including many Hindu and animist-influenced practices.
That's just cut n pasted from wikipedia cuz i'm lazy.
North Korea, officially the Democratic People's Republic of Korea (DPRK) (Hangul: 조선민주주의인민공화국, Chosŏn Minjujuŭi Inmin Konghwaguk), is a state in East Asia, occupying the northern half of the Korean Peninsula. Its capital and largest city is Pyongyang. The Korean Demilitarized Zone serves as the buffer area between North Korea and South Korea. The Amnok River is the border between North Korea and China. The Tumen River in the extreme north-east is the border with Russia.
East Asia is a subregion of Asia that can be defined in either geographical or cultural terms. Geographically and geopolitically, it covers about 12,000,000 km˛, or about 28 percent of the Asian continent, about 15 percent bigger than the area of Europe, though some categorize Tibet, Xinjiang, and Mongolia as Central Asia. In some contexts, Vietnam is considered part of East Asia because of the significant Chinese cultural influence it has experienced. More than 1.5 billion people, about 38 percent of the population of Asia or 22 percent of all the people in the world, live in geographic East Asia, which is about twice the population of Europe. The region is one of the world's most populated places, with the population density of East Asia, 131 per km˛, being about three times the world average of 45 per km˛. Using the UN subregion definitions, it ranks second in population only to South Asia.
Again all from Wiki cuz its all basically the same info as britannica or encarta and I don't feel like copying from multiple sources.