Korea accounts for nearly 70% of the world's total.Similar dolmens can be found in Manchuria, the Shandong Peninsula and the Kyushu island, yet it is unclear why this culture only flourished so extensively on the Korean Peninsula and its surroundings compared to the bigger remainder of Northeastern Asia.
Over the course of the 20th century, significant Korean communities have emerged in Australia, Canada, United States and, to a lesser extent, other nations with a primarily immigrant background.
(2017) said that the Ulchi people are genetically closest in the study's panel to the human remains from the Devil's Gate Cave which are dated to about 7,700 years ago.
Modern Korean and Japanese, the Oroqen people and the Hezhen people display a high affinity to the human remains from Devil's Gate Cave.
The Korean populations were populations in Jeju Island, Busan, Gwangju, Kongsan, Jeonju, Wonju, the Kannung of South Korea and a Korean population in Yanji.
Matsumoto said that the Gm ab3st gene is a marker for northern Mongoloid, and Matsumoto said that the average frequency of Gm ab3st for Koreans was 14.5% which was intermediate between an average frequency of 26% for general Japanese and a frequency of 11.7% which was for a Han population in Beijing.